diff --git a/app/index.js b/app/index.js
index aa67a3e639..2be1ad9ffe 100644
--- a/app/index.js
+++ b/app/index.js
@@ -83,6 +83,7 @@ async function main() {
     require('@jupyterlab/apputils-extension').default.filter(({ id }) =>
       [
         '@jupyterlab/apputils-extension:palette',
+        '@jupyter/apputils-extension:sanitizer',
         '@jupyterlab/apputils-extension:settings',
         '@jupyterlab/apputils-extension:state',
         '@jupyterlab/apputils-extension:themes',
@@ -175,11 +176,30 @@ async function main() {
     }
     case 'notebooks': {
       baseMods = baseMods.concat([
+        require('@jupyterlab/celltags-extension'),
         require('@jupyterlab/cell-toolbar-extension'),
+        require('@jupyterlab/debugger-extension').default.filter(({ id }) =>
+          [
+            '@jupyterlab/debugger-extension:config',
+            '@jupyterlab/debugger-extension:main',
+            '@jupyterlab/debugger-extension:notebooks',
+            '@jupyterlab/debugger-extension:service',
+            '@jupyterlab/debugger-extension:sidebar',
+            '@jupyterlab/debugger-extension:sources'
+          ].includes(id)
+        ),
         require('@jupyterlab/notebook-extension').default.filter(({ id }) =>
           [
             '@jupyterlab/notebook-extension:completer',
-            '@jupyterlab/notebook-extension:search'
+            '@jupyterlab/notebook-extension:search',
+            '@jupyterlab/notebook-extension:toc',
+            '@jupyterlab/notebook-extension:tools'
+          ].includes(id)
+        ),
+        require('@jupyterlab/toc-extension').default.filter(({ id }) =>
+          [
+            '@jupyterlab/toc-extension:registry',
+            '@jupyterlab/toc-extension:tracker'
           ].includes(id)
         ),
         require('@jupyterlab/tooltip-extension').default.filter(({ id }) =>
diff --git a/app/package.json b/app/package.json
index 821a59d41b..75f23604cf 100644
--- a/app/package.json
+++ b/app/package.json
@@ -29,6 +29,7 @@
     "@jupyterlab/cell-toolbar": "~4.0.0-alpha.14",
     "@jupyterlab/cell-toolbar-extension": "~4.0.0-alpha.14",
     "@jupyterlab/celltags": "~4.0.0-alpha.14",
+    "@jupyterlab/celltags-extension": "~4.0.0-alpha.14",
     "@jupyterlab/codeeditor": "~4.0.0-alpha.14",
     "@jupyterlab/codemirror-extension": "~4.0.0-alpha.14",
     "@jupyterlab/collaboration": "~4.0.0-alpha.14",
@@ -76,6 +77,7 @@
     "@jupyterlab/terminal-extension": "~4.0.0-alpha.14",
     "@jupyterlab/theme-dark-extension": "~4.0.0-alpha.14",
     "@jupyterlab/theme-light-extension": "~4.0.0-alpha.14",
+    "@jupyterlab/toc-extension": "~6.0.0-alpha.14",
     "@jupyterlab/tooltip": "~4.0.0-alpha.14",
     "@jupyterlab/tooltip-extension": "~4.0.0-alpha.14",
     "@jupyterlab/translation": "~4.0.0-alpha.14",
@@ -114,11 +116,13 @@
     "@jupyterlab/apputils-extension": "^4.0.0-alpha.14",
     "@jupyterlab/cell-toolbar-extension": "^4.0.0-alpha.14",
     "@jupyterlab/celltags": "^4.0.0-alpha.14",
+    "@jupyterlab/celltags-extension": "^4.0.0-alpha.14",
     "@jupyterlab/codemirror-extension": "^4.0.0-alpha.14",
     "@jupyterlab/collaboration-extension": "^4.0.0-alpha.14",
     "@jupyterlab/completer-extension": "^4.0.0-alpha.14",
     "@jupyterlab/console-extension": "^4.0.0-alpha.14",
     "@jupyterlab/coreutils": "^6.0.0-alpha.14",
+    "@jupyterlab/debugger-extension": "^4.0.0-alpha.14",
     "@jupyterlab/docmanager-extension": "^4.0.0-alpha.14",
     "@jupyterlab/docprovider-extension": "^4.0.0-alpha.14",
     "@jupyterlab/documentsearch-extension": "^4.0.0-alpha.14",
@@ -140,6 +144,7 @@
     "@jupyterlab/terminal-extension": "^4.0.0-alpha.14",
     "@jupyterlab/theme-dark-extension": "^4.0.0-alpha.14",
     "@jupyterlab/theme-light-extension": "^4.0.0-alpha.14",
+    "@jupyterlab/toc-extension": "^6.0.0-alpha.14",
     "@jupyterlab/tooltip-extension": "^4.0.0-alpha.14",
     "@jupyterlab/translation-extension": "^4.0.0-alpha.14",
     "@jupyterlab/vega5-extension": "^4.0.0-alpha.14"
@@ -181,6 +186,7 @@
       "@jupyterlab/codemirror-extension",
       "@jupyterlab/completer-extension",
       "@jupyterlab/console-extension",
+      "@jupyterlab/debugger-extension",
       "@jupyterlab/docmanager-extension",
       "@jupyterlab/documentsearch-extension",
       "@jupyterlab/filebrowser-extension",
@@ -211,6 +217,7 @@
       "@jupyterlab/completer",
       "@jupyterlab/console",
       "@jupyterlab/coreutils",
+      "@jupyterlab/debugger",
       "@jupyterlab/docmanager",
       "@jupyterlab/docprovider",
       "@jupyterlab/documentsearch",
diff --git a/packages/application-extension/src/index.ts b/packages/application-extension/src/index.ts
index eb3d469d1c..486ec23f07 100644
--- a/packages/application-extension/src/index.ts
+++ b/packages/application-extension/src/index.ts
@@ -35,16 +35,24 @@ import { ITranslator } from '@jupyterlab/translation';
 import {
   NotebookApp,
   NotebookShell,
-  INotebookShell
+  INotebookShell,
+  SideBarPanel,
+  SideBarHandler
 } from '@jupyter-notebook/application';
 
 import { jupyterIcon } from '@jupyter-notebook/ui-components';
 
 import { PromiseDelegate } from '@lumino/coreutils';
 
-import { DisposableDelegate, DisposableSet } from '@lumino/disposable';
+import {
+  DisposableDelegate,
+  DisposableSet,
+  IDisposable
+} from '@lumino/disposable';
+
+import { Menu, Widget } from '@lumino/widgets';
 
-import { Widget } from '@lumino/widgets';
+import { SideBarPalette } from './sidebarpalette';
 
 /**
  * A regular expression to match path to notebooks and documents
@@ -65,6 +73,11 @@ namespace CommandIDs {
    */
   export const toggleTop = 'application:toggle-top';
 
+  /**
+   * Toggle sidebar visibility
+   */
+  export const togglePanel = 'application:toggle-panel';
+
   /**
    * Toggle the Zen mode
    */
@@ -173,7 +186,7 @@ const opener: JupyterFrontEndPlugin<void> = {
         const file = decodeURIComponent(path);
         const urlParams = new URLSearchParams(parsed.search);
         const factory = urlParams.get('factory') ?? 'default';
-        app.restored.then(async () => {
+        app.started.then(async () => {
           docManager.open(file, factory, undefined, {
             ref: '_noref'
           });
@@ -187,8 +200,6 @@ const opener: JupyterFrontEndPlugin<void> = {
 
 /**
  * A plugin to customize menus
- *
- * TODO: use this plugin to customize the menu items and their order
  */
 const menus: JupyterFrontEndPlugin<void> = {
   id: '@jupyter-notebook/application-extension:menus',
@@ -557,6 +568,219 @@ const topVisibility: JupyterFrontEndPlugin<void> = {
   autoStart: true
 };
 
+/**
+ * Plugin to toggle the left or right sidebar's visibility.
+ */
+const sidebarVisibility: JupyterFrontEndPlugin<void> = {
+  id: '@jupyter-notebook/application-extension:sidebar',
+  requires: [INotebookShell, ITranslator],
+  optional: [IMainMenu, ICommandPalette],
+  autoStart: true,
+  activate: (
+    app: JupyterFrontEnd<JupyterFrontEnd.IShell>,
+    notebookShell: INotebookShell,
+    translator: ITranslator,
+    menu: IMainMenu | null,
+    palette: ICommandPalette | null
+  ) => {
+    const trans = translator.load('notebook');
+
+    /* Arguments for togglePanel command:
+     * side, left or right area
+     * title, widget title to show in the menu
+     * id, widget ID to activate in the sidebar
+     */
+    app.commands.addCommand(CommandIDs.togglePanel, {
+      label: args => args['title'] as string,
+      caption: args => {
+        // We do not substitute the parameter into the string because the parameter is not
+        // localized (e.g., it is always 'left') even though the string is localized.
+        if (args['side'] === 'left') {
+          return trans.__(
+            'Show %1 in the left sidebar',
+            args['title'] as string
+          );
+        } else if (args['side'] === 'right') {
+          return trans.__(
+            'Show %1 in the right sidebar',
+            args['title'] as string
+          );
+        }
+        return trans.__('Show %1 in the sidebar', args['title'] as string);
+      },
+      execute: args => {
+        switch (args['side'] as string) {
+          case 'left':
+            if (notebookShell.leftCollapsed) {
+              notebookShell.expandLeft(args.id as string);
+            } else if (
+              notebookShell.leftHandler.currentWidget?.id !== args.id
+            ) {
+              notebookShell.expandLeft(args.id as string);
+            } else {
+              notebookShell.collapseLeft();
+              if (notebookShell.currentWidget) {
+                notebookShell.activateById(notebookShell.currentWidget.id);
+              }
+            }
+            break;
+          case 'right':
+            if (notebookShell.rightCollapsed) {
+              notebookShell.expandRight(args.id as string);
+            } else if (
+              notebookShell.rightHandler.currentWidget?.id !== args.id
+            ) {
+              notebookShell.expandRight(args.id as string);
+            } else {
+              notebookShell.collapseRight();
+              if (notebookShell.currentWidget) {
+                notebookShell.activateById(notebookShell.currentWidget.id);
+              }
+            }
+            break;
+        }
+      },
+      isToggled: args => {
+        switch (args['side'] as string) {
+          case 'left': {
+            if (notebookShell.leftCollapsed) {
+              return false;
+            }
+            const currentWidget = notebookShell.leftHandler.currentWidget;
+            if (!currentWidget) {
+              return false;
+            }
+
+            return currentWidget.id === (args['id'] as string);
+          }
+          case 'right': {
+            if (notebookShell.rightCollapsed) {
+              return false;
+            }
+            const currentWidget = notebookShell.rightHandler.currentWidget;
+            if (!currentWidget) {
+              return false;
+            }
+
+            return currentWidget.id === (args['id'] as string);
+          }
+        }
+        return false;
+      }
+    });
+
+    const sideBarMenu: { [area in SideBarPanel.Area]: IDisposable | null } = {
+      left: null,
+      right: null
+    };
+
+    /**
+     * The function which adds entries to the View menu for each widget of a sidebar.
+     *
+     * @param area - 'left' or 'right', the area of the side bar.
+     * @param entryLabel - the name of the main entry in the View menu for that sidebar.
+     * @returns - The disposable menu added to the View menu or null.
+     */
+    const updateMenu = (area: SideBarPanel.Area, entryLabel: string) => {
+      if (menu === null) {
+        return null;
+      }
+
+      // Remove the previous menu entry for this sidebar.
+      sideBarMenu[area]?.dispose();
+
+      // Creates a new menu entry and populates it with sidebar widgets.
+      const newMenu = new Menu({ commands: app.commands });
+      newMenu.title.label = entryLabel;
+      const widgets = notebookShell.widgets(area);
+      let menuToAdd = false;
+
+      for (let widget of widgets) {
+        newMenu.addItem({
+          command: CommandIDs.togglePanel,
+          args: {
+            side: area,
+            title: `Show ${widget.title.caption}`,
+            id: widget.id
+          }
+        });
+        menuToAdd = true;
+      }
+
+      // If there are widgets, add the menu to the main menu entry.
+      if (menuToAdd) {
+        sideBarMenu[area] = menu.viewMenu.addItem({
+          type: 'submenu',
+          submenu: newMenu
+        });
+      }
+    };
+
+    app.restored.then(() => {
+      // Create menu entries for the left and right panel.
+      if (menu) {
+        const getSideBarLabel = (area: SideBarPanel.Area): string => {
+          if (area === 'left') {
+            return trans.__(`Left Sidebar`);
+          } else {
+            return trans.__(`Right Sidebar`);
+          }
+        };
+        const leftArea = notebookShell.leftHandler.area;
+        const leftLabel = getSideBarLabel(leftArea);
+        updateMenu(leftArea, leftLabel);
+
+        const rightArea = notebookShell.rightHandler.area;
+        const rightLabel = getSideBarLabel(rightArea);
+        updateMenu(rightArea, rightLabel);
+
+        const handleSideBarChange = (
+          sidebar: SideBarHandler,
+          widget: Widget
+        ) => {
+          const label = getSideBarLabel(sidebar.area);
+          updateMenu(sidebar.area, label);
+        };
+
+        notebookShell.leftHandler.widgetAdded.connect(handleSideBarChange);
+        notebookShell.leftHandler.widgetRemoved.connect(handleSideBarChange);
+        notebookShell.rightHandler.widgetAdded.connect(handleSideBarChange);
+        notebookShell.rightHandler.widgetRemoved.connect(handleSideBarChange);
+      }
+
+      // Add palette entries for side panels.
+      if (palette) {
+        const sideBarPalette = new SideBarPalette({
+          commandPalette: palette as ICommandPalette,
+          command: CommandIDs.togglePanel
+        });
+
+        notebookShell.leftHandler.widgets.forEach(widget => {
+          sideBarPalette.addItem(widget, notebookShell.leftHandler.area);
+        });
+
+        notebookShell.rightHandler.widgets.forEach(widget => {
+          sideBarPalette.addItem(widget, notebookShell.rightHandler.area);
+        });
+
+        // Update menu and palette when widgets are added or removed from sidebars.
+        notebookShell.leftHandler.widgetAdded.connect((sidebar, widget) => {
+          sideBarPalette.addItem(widget, sidebar.area);
+        });
+        notebookShell.leftHandler.widgetRemoved.connect((sidebar, widget) => {
+          sideBarPalette.removeItem(widget, sidebar.area);
+        });
+        notebookShell.rightHandler.widgetAdded.connect((sidebar, widget) => {
+          sideBarPalette.addItem(widget, sidebar.area);
+        });
+        notebookShell.rightHandler.widgetRemoved.connect((sidebar, widget) => {
+          sideBarPalette.removeItem(widget, sidebar.area);
+        });
+      }
+    });
+  }
+};
+
 /**
  * The default tree route resolver plugin.
  */
@@ -711,6 +935,7 @@ const plugins: JupyterFrontEndPlugin<any>[] = [
   router,
   sessionDialogs,
   shell,
+  sidebarVisibility,
   status,
   tabTitle,
   title,
diff --git a/packages/application-extension/src/sidebarpalette.ts b/packages/application-extension/src/sidebarpalette.ts
new file mode 100644
index 0000000000..e47c33be6c
--- /dev/null
+++ b/packages/application-extension/src/sidebarpalette.ts
@@ -0,0 +1,114 @@
+import { ICommandPalette } from '@jupyterlab/apputils';
+import { IDisposable } from '@lumino/disposable';
+import { Widget } from '@lumino/widgets';
+
+/**
+ * A class to manages the palette entries associated to the side bar.
+ */
+export class SideBarPalette {
+  /**
+   * Construct a new side bar palette.
+   */
+  constructor(options: SideBarPaletteOption) {
+    this._commandPalette = options.commandPalette;
+    this._command = options.command;
+  }
+
+  /**
+   * Get a command palette item from the widget id and the area.
+   */
+  getItem(
+    widget: Readonly<Widget>,
+    area: 'left' | 'right'
+  ): SideBarPaletteItem | null {
+    const itemList = this._items;
+    for (let i = 0; i < itemList.length; i++) {
+      const item = itemList[i];
+      if (item.widgetId == widget.id && item.area == area) {
+        return item;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Add an item to the command palette.
+   */
+  addItem(widget: Readonly<Widget>, area: 'left' | 'right'): void {
+    // Check if the item does not already exist.
+    if (this.getItem(widget, area)) {
+      return;
+    }
+
+    // Add a new item in command palette.
+    const disposableDelegate = this._commandPalette.addItem({
+      command: this._command,
+      category: 'View',
+      args: {
+        side: area,
+        title: `Show ${widget.title.caption}`,
+        id: widget.id
+      }
+    });
+
+    // Keep the disposableDelegate objet to be able to dispose of the item if the widget
+    // is remove from the side bar.
+    this._items.push({
+      widgetId: widget.id,
+      area: area,
+      disposable: disposableDelegate
+    });
+  }
+
+  /**
+   * Remove an item from the command palette.
+   */
+  removeItem(widget: Readonly<Widget>, area: 'left' | 'right'): void {
+    const item = this.getItem(widget, area);
+    if (item) {
+      item.disposable.dispose();
+    }
+  }
+
+  _command: string;
+  _commandPalette: ICommandPalette;
+  _items: SideBarPaletteItem[] = [];
+}
+
+type SideBarPaletteItem = {
+  /**
+   * The ID of the widget associated to the command palette.
+   */
+  widgetId: string;
+
+  /**
+   * The area of the panel associated to the command palette.
+   */
+  area: 'left' | 'right';
+
+  /**
+   * The disposable object to remove the item from command palette.
+   */
+  disposable: IDisposable;
+};
+
+/**
+ * An interface for the options to include in SideBarPalette constructor.
+ */
+type SideBarPaletteOption = {
+  /**
+   * The commands palette.
+   */
+  commandPalette: ICommandPalette;
+
+  /**
+   * The command to call from each sidebar menu entry.
+   *
+   * ### Notes
+   * That command required 3 args :
+   *      side: 'left' | 'right', the area to toggle
+   *      title: string, label of the command
+   *      id: string, id of the widget to activate
+   */
+  command: string;
+};
diff --git a/packages/application/src/app.ts b/packages/application/src/app.ts
index 36efb573ab..5f1acc1e62 100644
--- a/packages/application/src/app.ts
+++ b/packages/application/src/app.ts
@@ -34,6 +34,9 @@ export class NotebookApp extends JupyterFrontEnd<INotebookShell> {
         this.registerPlugin(plugin);
       }
     }
+
+    this.restored = this.shell.restored;
+
     this.restored.then(() => this._formatter.invoke());
   }
 
@@ -52,6 +55,11 @@ export class NotebookApp extends JupyterFrontEnd<INotebookShell> {
    */
   readonly status = new LabStatus(this);
 
+  /**
+   * Promise that resolves when the state is first restored
+   */
+  readonly restored: Promise<void>;
+
   /**
    * The version of the application.
    */
diff --git a/packages/application/src/shell.ts b/packages/application/src/shell.ts
index 395362f392..fc97e4393a 100644
--- a/packages/application/src/shell.ts
+++ b/packages/application/src/shell.ts
@@ -2,18 +2,21 @@
 // Distributed under the terms of the Modified BSD License.
 
 import { JupyterFrontEnd } from '@jupyterlab/application';
-
 import { DocumentRegistry } from '@jupyterlab/docregistry';
+import { closeIcon } from '@jupyterlab/ui-components';
 
-import { ArrayExt } from '@lumino/algorithm';
-
-import { Token } from '@lumino/coreutils';
-
+import { ArrayExt, find } from '@lumino/algorithm';
+import { PromiseDelegate, Token } from '@lumino/coreutils';
 import { Message, MessageLoop, IMessageHandler } from '@lumino/messaging';
-
 import { ISignal, Signal } from '@lumino/signaling';
 
-import { Panel, Widget, BoxLayout } from '@lumino/widgets';
+import {
+  BoxLayout,
+  Panel,
+  SplitPanel,
+  StackedPanel,
+  Widget
+} from '@lumino/widgets';
 
 /**
  * The Jupyter Notebook application shell token.
@@ -40,37 +43,75 @@ export class NotebookShell extends Widget implements JupyterFrontEnd.IShell {
     super();
     this.id = 'main';
 
-    const rootLayout = new BoxLayout();
-
     this._topHandler = new Private.PanelHandler();
     this._menuHandler = new Private.PanelHandler();
+    this._leftHandler = new SideBarHandler('left');
+    this._rightHandler = new SideBarHandler('right');
     this._main = new Panel();
+    const topWrapper = (this._topWrapper = new Panel());
+    const menuWrapper = (this._menuWrapper = new Panel());
 
     this._topHandler.panel.id = 'top-panel';
     this._menuHandler.panel.id = 'menu-panel';
     this._main.id = 'main-panel';
 
+    this._spacer = new Widget();
+    this._spacer.id = 'spacer-widget';
+
     // create wrappers around the top and menu areas
-    const topWrapper = (this._topWrapper = new Panel());
     topWrapper.id = 'top-panel-wrapper';
     topWrapper.addWidget(this._topHandler.panel);
 
-    const menuWrapper = (this._menuWrapper = new Panel());
     menuWrapper.id = 'menu-panel-wrapper';
     menuWrapper.addWidget(this._menuHandler.panel);
 
-    BoxLayout.setStretch(topWrapper, 0);
-    BoxLayout.setStretch(menuWrapper, 0);
+    const rootLayout = new BoxLayout();
+    const leftHandler = this._leftHandler;
+    const rightHandler = this._rightHandler;
+
+    leftHandler.panel.id = 'jp-left-stack';
+    rightHandler.panel.id = 'jp-right-stack';
+
+    // Hide the side panels by default.
+    leftHandler.hide();
+    rightHandler.hide();
+
+    const middleLayout = new BoxLayout({
+      spacing: 0,
+      direction: 'top-to-bottom'
+    });
+    BoxLayout.setStretch(this._topWrapper, 0);
+    BoxLayout.setStretch(this._menuWrapper, 0);
     BoxLayout.setStretch(this._main, 1);
 
-    this._spacer = new Widget();
-    this._spacer.id = 'spacer-widget';
+    const middlePanel = new Panel({ layout: middleLayout });
+    middlePanel.addWidget(this._topWrapper);
+    middlePanel.addWidget(this._menuWrapper);
+    middlePanel.addWidget(this._spacer);
+    middlePanel.addWidget(this._main);
+    middlePanel.layout = middleLayout;
+
+    // TODO: Consider storing this as an attribute this._hsplitPanel if saving/restoring layout needed
+    const hsplitPanel = new SplitPanel();
+    hsplitPanel.id = 'main-split-panel';
+    hsplitPanel.spacing = 1;
+    BoxLayout.setStretch(hsplitPanel, 1);
+
+    SplitPanel.setStretch(leftHandler.panel, 0);
+    SplitPanel.setStretch(rightHandler.panel, 0);
+    SplitPanel.setStretch(middlePanel, 1);
+
+    hsplitPanel.addWidget(leftHandler.panel);
+    hsplitPanel.addWidget(middlePanel);
+    hsplitPanel.addWidget(rightHandler.panel);
+
+    // Use relative sizing to set the width of the side panels.
+    // This will still respect the min-size of children widget in the stacked
+    // panel.
+    hsplitPanel.setRelativeSizes([1, 2.5, 1]);
 
     rootLayout.spacing = 0;
-    rootLayout.addWidget(topWrapper);
-    rootLayout.addWidget(menuWrapper);
-    rootLayout.addWidget(this._spacer);
-    rootLayout.addWidget(this._main);
+    rootLayout.addWidget(hsplitPanel);
 
     this.layout = rootLayout;
   }
@@ -103,13 +144,59 @@ export class NotebookShell extends Widget implements JupyterFrontEnd.IShell {
     return this._menuWrapper;
   }
 
+  /**
+   * Get the left area handler
+   */
+  get leftHandler(): SideBarHandler {
+    return this._leftHandler;
+  }
+
+  /**
+   * Get the right area handler
+   */
+  get rightHandler(): SideBarHandler {
+    return this._rightHandler;
+  }
+
+  /**
+   * Is the left sidebar visible?
+   */
+  get leftCollapsed(): boolean {
+    return !(this._leftHandler.isVisible && this._leftHandler.panel.isVisible);
+  }
+
+  /**
+   * Is the right sidebar visible?
+   */
+  get rightCollapsed(): boolean {
+    return !(
+      this._rightHandler.isVisible && this._rightHandler.panel.isVisible
+    );
+  }
+
+  /**
+   * Promise that resolves when the main widget is loaded
+   */
+  get restored(): Promise<void> {
+    return this._mainWidgetLoaded.promise;
+  }
+
   /**
    * Activate a widget in its area.
    */
   activateById(id: string): void {
-    const widget = this._main.widgets.find(w => w.id === id);
-    if (widget) {
-      widget.activate();
+    // Search all areas that can have widgets for this widget, starting with main.
+    for (const area of ['main', 'top', 'left', 'right', 'menu']) {
+      const widget = find(this.widgets(area as Shell.Area), w => w.id === id);
+      if (widget) {
+        if (area === 'left') {
+          this.expandLeft(id);
+        } else if (area === 'right') {
+          this.expandRight(id);
+        } else {
+          widget.activate();
+        }
+      }
     }
   }
 
@@ -130,20 +217,28 @@ export class NotebookShell extends Widget implements JupyterFrontEnd.IShell {
     options?: DocumentRegistry.IOpenOptions
   ): void {
     const rank = options?.rank ?? DEFAULT_RANK;
-    if (area === 'top') {
-      return this._topHandler.addWidget(widget, rank);
-    }
-    if (area === 'menu') {
-      return this._menuHandler.addWidget(widget, rank);
-    }
-    if (area === 'main' || area === undefined) {
-      if (this._main.widgets.length > 0) {
-        // do not add the widget if there is already one
-        return;
-      }
-      this._main.addWidget(widget);
-      this._main.update();
-      this._currentChanged.emit(void 0);
+    switch (area) {
+      case 'top':
+        return this._topHandler.addWidget(widget, rank);
+      case 'menu':
+        return this._menuHandler.addWidget(widget, rank);
+      case 'main':
+      case undefined:
+        if (this._main.widgets.length > 0) {
+          // do not add the widget if there is already one
+          return;
+        }
+        this._main.addWidget(widget);
+        this._main.update();
+        this._currentChanged.emit(void 0);
+        this._mainWidgetLoaded.resolve();
+        break;
+      case 'left':
+        return this._leftHandler.addWidget(widget, rank);
+      case 'right':
+        return this._rightHandler.addWidget(widget, rank);
+      default:
+        console.warn(`Cannot add widget to area: ${area}`);
     }
   }
 
@@ -179,19 +274,60 @@ export class NotebookShell extends Widget implements JupyterFrontEnd.IShell {
       case 'main':
         yield* this._main.widgets;
         return;
+      case 'left':
+        yield* this._leftHandler.widgets;
+        return;
+      case 'right':
+        yield* this._rightHandler.widgets;
+        return;
       default:
         console.error(`This shell has no area called "${area}"`);
         return;
     }
   }
 
+  /**
+   * Expand the left panel to show the sidebar with its widget.
+   */
+  expandLeft(id?: string): void {
+    this._leftHandler.panel.show();
+    this._leftHandler.expand(id); // Show the current widget, if any
+  }
+
+  /**
+   * Collapse the left panel
+   */
+  collapseLeft(): void {
+    this._leftHandler.collapse();
+    this._leftHandler.panel.hide();
+  }
+
+  /**
+   * Expand the right panel to show the sidebar with its widget.
+   */
+  expandRight(id?: string): void {
+    this._rightHandler.panel.show();
+    this._rightHandler.expand(id); // Show the current widget, if any
+  }
+
+  /**
+   * Collapse the right panel
+   */
+  collapseRight(): void {
+    this._rightHandler.collapse();
+    this._rightHandler.panel.hide();
+  }
+
   private _topWrapper: Panel;
   private _topHandler: Private.PanelHandler;
   private _menuWrapper: Panel;
   private _menuHandler: Private.PanelHandler;
+  private _leftHandler: SideBarHandler;
+  private _rightHandler: SideBarHandler;
   private _spacer: Widget;
   private _main: Panel;
   private _currentChanged = new Signal<this, void>(this);
+  private _mainWidgetLoaded = new PromiseDelegate<void>();
 }
 
 /**
@@ -201,7 +337,243 @@ export namespace Shell {
   /**
    * The areas of the application shell where widgets can reside.
    */
-  export type Area = 'main' | 'top' | 'menu';
+  export type Area = 'main' | 'top' | 'left' | 'right' | 'menu';
+}
+
+/**
+ * A name space for SideBarPanel functions.
+ */
+export namespace SideBarPanel {
+  /**
+   * The areas of the sidebar panel
+   */
+  export type Area = 'left' | 'right';
+}
+
+/**
+ * A class which manages a side bar that can show at most one widget at a time.
+ */
+export class SideBarHandler {
+  /**
+   * Construct a new side bar handler.
+   */
+  constructor(area: SideBarPanel.Area) {
+    this._area = area;
+    this._panel = new Panel();
+    this._panel.hide();
+
+    this._currentWidget = null;
+    this._lastCurrentWidget = null;
+
+    this._widgetPanel = new StackedPanel();
+    this._widgetPanel.widgetRemoved.connect(this._onWidgetRemoved, this);
+
+    const closeButton = document.createElement('button');
+    closeIcon.element({
+      container: closeButton,
+      height: '16px',
+      width: 'auto'
+    });
+    closeButton.onclick = () => {
+      this.collapse();
+      this.hide();
+    };
+    closeButton.className = 'jp-Button jp-SidePanel-collapse';
+    const icon = new Widget({ node: closeButton });
+    this._panel.addWidget(icon);
+    this._panel.addWidget(this._widgetPanel);
+  }
+
+  /**
+   * Get the current widget in the sidebar panel.
+   */
+  get currentWidget(): Widget | null {
+    return (
+      this._currentWidget ||
+      this._lastCurrentWidget ||
+      (this._items.length > 0 ? this._items[0].widget : null)
+    );
+  }
+
+  /**
+   * Get the area of the side panel
+   */
+  get area(): SideBarPanel.Area {
+    return this._area;
+  }
+
+  /**
+   * Whether the panel is visible
+   */
+  get isVisible(): boolean {
+    return this._panel.isVisible;
+  }
+
+  /**
+   * Get the stacked panel managed by the handler
+   */
+  get panel(): Panel {
+    return this._panel;
+  }
+
+  /**
+   * Get the widgets list.
+   */
+  get widgets(): Readonly<Widget[]> {
+    return this._items.map(obj => obj.widget);
+  }
+
+  /**
+   * Signal fired when a widget is added to the panel
+   */
+  get widgetAdded(): ISignal<SideBarHandler, Widget> {
+    return this._widgetAdded;
+  }
+
+  /**
+   * Signal fired when a widget is removed from the panel
+   */
+  get widgetRemoved(): ISignal<SideBarHandler, Widget> {
+    return this._widgetRemoved;
+  }
+
+  /**
+   * Expand the sidebar.
+   *
+   * #### Notes
+   * This will open the most recently used widget, or the first widget
+   * if there is no most recently used.
+   */
+  expand(id?: string): void {
+    if (this._currentWidget) {
+      this.collapse();
+    }
+    if (id) {
+      this.activate(id);
+    } else {
+      const visibleWidget = this.currentWidget;
+      if (visibleWidget) {
+        this._currentWidget = visibleWidget;
+        this.activate(visibleWidget.id);
+      }
+    }
+  }
+
+  /**
+   * Activate a widget residing in the stacked panel by ID.
+   *
+   * @param id - The widget's unique ID.
+   */
+  activate(id: string): void {
+    const widget = this._findWidgetByID(id);
+    if (widget) {
+      this._currentWidget = widget;
+      widget.show();
+      widget.activate();
+    }
+  }
+
+  /**
+   * Test whether the sidebar has the given widget by id.
+   */
+  has(id: string): boolean {
+    return this._findWidgetByID(id) !== null;
+  }
+
+  /**
+   * Collapse the sidebar so no items are expanded.
+   */
+  collapse(): void {
+    this._currentWidget?.hide();
+    this._currentWidget = null;
+  }
+
+  /**
+   * Add a widget and its title to the stacked panel.
+   *
+   * If the widget is already added, it will be moved.
+   */
+  addWidget(widget: Widget, rank: number): void {
+    widget.parent = null;
+    widget.hide();
+    const item = { widget, rank };
+    const index = this._findInsertIndex(item);
+    ArrayExt.insert(this._items, index, item);
+    this._widgetPanel.insertWidget(index, widget);
+
+    this._refreshVisibility();
+
+    this._widgetAdded.emit(widget);
+  }
+
+  /**
+   * Hide the side panel
+   */
+  hide(): void {
+    this._isHiddenByUser = true;
+    this._refreshVisibility();
+  }
+
+  /**
+   * Show the side panel
+   */
+  show(): void {
+    this._isHiddenByUser = false;
+    this._refreshVisibility();
+  }
+
+  /**
+   * Find the insertion index for a rank item.
+   */
+  private _findInsertIndex(item: Private.IRankItem): number {
+    return ArrayExt.upperBound(this._items, item, Private.itemCmp);
+  }
+
+  /**
+   * Find the index of the item with the given widget, or `-1`.
+   */
+  private _findWidgetIndex(widget: Widget): number {
+    return ArrayExt.findFirstIndex(this._items, i => i.widget === widget);
+  }
+
+  /**
+   * Find the widget with the given id, or `null`.
+   */
+  private _findWidgetByID(id: string): Widget | null {
+    const item = find(this._items, value => value.widget.id === id);
+    return item ? item.widget : null;
+  }
+
+  /**
+   * Refresh the visibility of the stacked panel.
+   */
+  private _refreshVisibility(): void {
+    this._panel.setHidden(this._isHiddenByUser);
+  }
+
+  /*
+   * Handle the `widgetRemoved` signal from the panel.
+   */
+  private _onWidgetRemoved(sender: StackedPanel, widget: Widget): void {
+    if (widget === this._lastCurrentWidget) {
+      this._lastCurrentWidget = null;
+    }
+    ArrayExt.removeAt(this._items, this._findWidgetIndex(widget));
+
+    this._refreshVisibility();
+
+    this._widgetRemoved.emit(widget);
+  }
+
+  private _area: SideBarPanel.Area;
+  private _isHiddenByUser = false;
+  private _items = new Array<Private.IRankItem>();
+  private _panel: Panel;
+  private _widgetPanel: StackedPanel;
+  private _currentWidget: Widget | null;
+  private _lastCurrentWidget: Widget | null;
+  private _widgetAdded: Signal<SideBarHandler, Widget> = new Signal(this);
+  private _widgetRemoved: Signal<SideBarHandler, Widget> = new Signal(this);
 }
 
 /**
diff --git a/packages/application/style/index.css b/packages/application/style/index.css
index 4c504055e4..80ff961161 100644
--- a/packages/application/style/index.css
+++ b/packages/application/style/index.css
@@ -8,3 +8,4 @@
 @import url('~@jupyterlab/ui-components/style/index.css');
 
 @import url('./base.css');
+@import url('./sidepanel.css');
diff --git a/packages/application/style/index.js b/packages/application/style/index.js
index bac719f165..a84ae1e2b5 100644
--- a/packages/application/style/index.js
+++ b/packages/application/style/index.js
@@ -8,3 +8,4 @@ import '@jupyterlab/mainmenu/style/index.js';
 import '@jupyterlab/ui-components/style/index.js';
 
 import './base.css';
+import './sidepanel.css';
diff --git a/packages/application/style/sidepanel.css b/packages/application/style/sidepanel.css
new file mode 100644
index 0000000000..61057e362c
--- /dev/null
+++ b/packages/application/style/sidepanel.css
@@ -0,0 +1,48 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) Jupyter Development Team.
+| Distributed under the terms of the Modified BSD License.
+|
+| Adapted from JupyterLab's packages/application/style/sidepanel.css.
+|----------------------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+| Variables
+|----------------------------------------------------------------------------*/
+
+:root {
+  --jp-private-sidebar-tab-width: 32px;
+}
+
+/*-----------------------------------------------------------------------------
+| SideBar
+|----------------------------------------------------------------------------*/
+
+/* Stack panels */
+
+#jp-right-stack,
+#jp-left-stack {
+  display: flex;
+  flex-direction: column;
+  min-width: var(--jp-sidebar-min-width);
+}
+
+#jp-left-stack .jp-SidePanel-collapse,
+#jp-right-stack .jp-SidePanel-collapse {
+  display: flex;
+  flex: 0 0 auto;
+  min-height: 0;
+  padding: 0;
+}
+
+#jp-left-stack .jp-SidePanel-collapse {
+  justify-content: right;
+}
+
+#jp-right-stack .jp-SidePanel-collapse {
+  justify-content: left;
+}
+
+#jp-left-stack .lm-StackedPanel,
+#jp-right-stack .lm-StackedPanel {
+  flex: 1 1 auto;
+}
diff --git a/packages/application/test/shell.spec.ts b/packages/application/test/shell.spec.ts
index d44d3bfe55..b419d0305c 100644
--- a/packages/application/test/shell.spec.ts
+++ b/packages/application/test/shell.spec.ts
@@ -1,13 +1,17 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-import { NotebookShell, INotebookShell } from '@jupyter-notebook/application';
+import {
+  INotebookShell,
+  NotebookShell,
+  Shell
+} from '@jupyter-notebook/application';
 
 import { JupyterFrontEnd } from '@jupyterlab/application';
 
 import { Widget } from '@lumino/widgets';
 
-describe('Shell', () => {
+describe('Shell for notebooks', () => {
   let shell: INotebookShell;
 
   beforeEach(() => {
@@ -23,10 +27,17 @@ describe('Shell', () => {
     it('should create a LabShell instance', () => {
       expect(shell).toBeInstanceOf(NotebookShell);
     });
+
+    it('should make all areas empty initially', () => {
+      ['main', 'top', 'left', 'right', 'menu'].forEach(area => {
+        const widgets = Array.from(shell.widgets(area as Shell.Area));
+        expect(widgets.length).toEqual(0);
+      });
+    });
   });
 
   describe('#widgets()', () => {
-    it('should add widgets to existing areas', () => {
+    it('should add widgets to main area', () => {
       const widget = new Widget();
       shell.add(widget, 'main');
       const widgets = Array.from(shell.widgets('main'));
@@ -36,7 +47,7 @@ describe('Shell', () => {
     it('should be empty and console.error if area does not exist', () => {
       const spy = jest.spyOn(console, 'error');
       const jupyterFrontEndShell = shell as JupyterFrontEnd.IShell;
-      expect(Array.from(jupyterFrontEndShell.widgets('left'))).toHaveLength(0);
+      expect(Array.from(jupyterFrontEndShell.widgets('fake'))).toHaveLength(0);
       expect(spy).toHaveBeenCalled();
     });
   });
@@ -82,4 +93,86 @@ describe('Shell', () => {
       expect(widgets.length).toBeGreaterThan(0);
     });
   });
+
+  describe('#add(widget, "left")', () => {
+    it('should add a widget to the left area', () => {
+      const widget = new Widget();
+      widget.id = 'foo';
+      shell.add(widget, 'left');
+      const widgets = Array.from(shell.widgets('left'));
+      expect(widgets.length).toBeGreaterThan(0);
+    });
+  });
+
+  describe('#add(widget, "right")', () => {
+    it('should add a widget to the right area', () => {
+      const widget = new Widget();
+      widget.id = 'foo';
+      shell.add(widget, 'right');
+      const widgets = Array.from(shell.widgets('right'));
+      expect(widgets.length).toBeGreaterThan(0);
+    });
+  });
+});
+
+describe('Shell for tree view', () => {
+  let shell: INotebookShell;
+
+  beforeEach(() => {
+    shell = new NotebookShell();
+    Widget.attach(shell, document.body);
+  });
+
+  afterEach(() => {
+    shell.dispose();
+  });
+
+  describe('#constructor()', () => {
+    it('should create a LabShell instance', () => {
+      expect(shell).toBeInstanceOf(NotebookShell);
+    });
+
+    it('should make all areas empty initially', () => {
+      ['main', 'top', 'left', 'right', 'menu'].forEach(area => {
+        const widgets = Array.from(shell.widgets(area as Shell.Area));
+        expect(widgets.length).toEqual(0);
+      });
+    });
+  });
+
+  describe('#widgets()', () => {
+    it('should add widgets to existing areas', () => {
+      const widget = new Widget();
+      shell.add(widget, 'main');
+      const widgets = Array.from(shell.widgets('main'));
+      expect(widgets).toEqual([widget]);
+    });
+
+    it('should throw an exception if a fake area does not exist', () => {
+      const spy = jest.spyOn(console, 'error');
+      const jupyterFrontEndShell = shell as JupyterFrontEnd.IShell;
+      expect(Array.from(jupyterFrontEndShell.widgets('fake'))).toHaveLength(0);
+      expect(spy).toHaveBeenCalled();
+    });
+  });
+
+  describe('#add(widget, "left")', () => {
+    it('should add a widget to the left area', () => {
+      const widget = new Widget();
+      widget.id = 'foo';
+      shell.add(widget, 'left');
+      const widgets = Array.from(shell.widgets('left'));
+      expect(widgets.length).toBeGreaterThan(0);
+    });
+  });
+
+  describe('#add(widget, "right")', () => {
+    it('should add a widget to the right area', () => {
+      const widget = new Widget();
+      widget.id = 'foo';
+      shell.add(widget, 'right');
+      const widgets = Array.from(shell.widgets('right'));
+      expect(widgets.length).toBeGreaterThan(0);
+    });
+  });
 });
diff --git a/packages/notebook-extension/src/index.ts b/packages/notebook-extension/src/index.ts
index c32ac3687a..163da86426 100644
--- a/packages/notebook-extension/src/index.ts
+++ b/packages/notebook-extension/src/index.ts
@@ -18,7 +18,11 @@ import { Text, Time } from '@jupyterlab/coreutils';
 
 import { IDocumentManager } from '@jupyterlab/docmanager';
 
-import { NotebookPanel, INotebookTracker } from '@jupyterlab/notebook';
+import {
+  NotebookPanel,
+  INotebookTracker,
+  INotebookTools
+} from '@jupyterlab/notebook';
 
 import { ISettingRegistry } from '@jupyterlab/settingregistry';
 
@@ -327,6 +331,34 @@ const scrollOutput: JupyterFrontEndPlugin<void> = {
   }
 };
 
+/**
+ * A plugin to add the NotebookTools to the side panel;
+ */
+const notebookToolsWidget: JupyterFrontEndPlugin<void> = {
+  id: '@jupyter-notebook/notebook-extension:notebook-tools',
+  autoStart: true,
+  requires: [INotebookShell],
+  optional: [INotebookTools],
+  activate: (
+    app: JupyterFrontEnd,
+    shell: INotebookShell,
+    notebookTools: INotebookTools | null
+  ) => {
+    const onChange = async () => {
+      const current = shell.currentWidget;
+      if (!(current instanceof NotebookPanel)) {
+        return;
+      }
+
+      // Add the notebook tools in right area.
+      if (notebookTools) {
+        shell.add(notebookTools, 'right');
+      }
+    };
+    shell.currentChanged.connect(onChange);
+  }
+};
+
 /**
  * Export the plugins as default.
  */
@@ -334,7 +366,8 @@ const plugins: JupyterFrontEndPlugin<any>[] = [
   checkpoints,
   kernelLogo,
   kernelStatus,
-  scrollOutput
+  scrollOutput,
+  notebookToolsWidget
 ];
 
 export default plugins;
diff --git a/ui-tests/test/general.spec.ts b/ui-tests/test/general.spec.ts
index 6ee5e92754..57cc907621 100644
--- a/ui-tests/test/general.spec.ts
+++ b/ui-tests/test/general.spec.ts
@@ -6,6 +6,7 @@ import path from 'path';
 import { expect } from '@playwright/test';
 
 import { test } from './fixtures';
+
 import { waitForKernelReady } from './utils';
 
 test.describe('General', () => {
diff --git a/ui-tests/test/general.spec.ts-snapshots/notebook-chromium-linux.png b/ui-tests/test/general.spec.ts-snapshots/notebook-chromium-linux.png
index 5e6a20f6f5..70d9aba2ed 100644
Binary files a/ui-tests/test/general.spec.ts-snapshots/notebook-chromium-linux.png and b/ui-tests/test/general.spec.ts-snapshots/notebook-chromium-linux.png differ
diff --git a/ui-tests/test/general.spec.ts-snapshots/notebook-firefox-linux.png b/ui-tests/test/general.spec.ts-snapshots/notebook-firefox-linux.png
index d40340ac0c..7079711594 100644
Binary files a/ui-tests/test/general.spec.ts-snapshots/notebook-firefox-linux.png and b/ui-tests/test/general.spec.ts-snapshots/notebook-firefox-linux.png differ
diff --git a/ui-tests/test/menus.spec.ts b/ui-tests/test/menus.spec.ts
index f1c1b95af3..7b957d3c92 100644
--- a/ui-tests/test/menus.spec.ts
+++ b/ui-tests/test/menus.spec.ts
@@ -6,6 +6,7 @@ import path from 'path';
 import { test } from './fixtures';
 
 import { expect } from '@playwright/test';
+import { waitForKernelReady } from './utils';
 
 const NOTEBOOK = 'empty.ipynb';
 
@@ -32,19 +33,18 @@ test.describe('Notebook Menus', () => {
     );
   });
 
-  test.afterEach(async ({ page }) => {
-    await page.kernel.shutdownAll();
-  });
-
   MENU_PATHS.forEach(menuPath => {
     test(`Open menu item ${menuPath}`, async ({ page, tmpPath }) => {
       await page.goto(`notebooks/${tmpPath}/${NOTEBOOK}`);
+      await waitForKernelReady(page);
+
       await page.menu.open(menuPath);
       expect(await page.menu.isOpen(menuPath)).toBeTruthy();
 
       const imageName = `opened-menu-${menuPath.replace(/>/g, '-')}.png`;
       const menu = await page.menu.getOpenMenu();
-      expect(await menu.screenshot()).toMatchSnapshot(imageName.toLowerCase());
+      expect(menu).toBeDefined();
+      expect(await menu!.screenshot()).toMatchSnapshot(imageName.toLowerCase());
     });
   });
 });
diff --git a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-edit-firefox-linux.png b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-edit-firefox-linux.png
index 532ee2d260..7699903bf9 100644
Binary files a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-edit-firefox-linux.png and b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-edit-firefox-linux.png differ
diff --git a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-chromium-linux.png b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-chromium-linux.png
index 4a8ca8a0f0..2832e5b538 100644
Binary files a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-chromium-linux.png and b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-chromium-linux.png differ
diff --git a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-firefox-linux.png b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-firefox-linux.png
index 7900a8cd77..27910d69f2 100644
Binary files a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-firefox-linux.png and b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-kernel-firefox-linux.png differ
diff --git a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-chromium-linux.png b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-chromium-linux.png
index 5c0712c35d..cfc60f6e5b 100644
Binary files a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-chromium-linux.png and b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-chromium-linux.png differ
diff --git a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-firefox-linux.png b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-firefox-linux.png
index 0410efbf6c..9cb32711f5 100644
Binary files a/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-firefox-linux.png and b/ui-tests/test/menus.spec.ts-snapshots/opened-menu-view-firefox-linux.png differ
diff --git a/ui-tests/test/mobile.spec.ts b/ui-tests/test/mobile.spec.ts
index 1cafd84d4f..fd4eb17dc3 100644
--- a/ui-tests/test/mobile.spec.ts
+++ b/ui-tests/test/mobile.spec.ts
@@ -6,9 +6,10 @@ import path from 'path';
 import { expect } from '@playwright/test';
 
 import { test } from './fixtures';
+
 import { waitForKernelReady } from './utils';
 
-test.use({ autoGoto: false, viewport: { width: 512, height: 768 } });
+test.use({ autoGoto: false });
 
 test.describe('Mobile', () => {
   test('The layout should be more compact on the file browser page', async ({
@@ -16,7 +17,13 @@ test.describe('Mobile', () => {
     tmpPath
   }) => {
     await page.goto(`tree/${tmpPath}`);
+
+    // temporary workaround to trigger a toolbar resize
+    // TODO: investigate in https://github.com/jupyter/notebook/issues/6553
+    await page.setViewportSize({ width: 524, height: 800 });
+
     await page.waitForSelector('#top-panel-wrapper', { state: 'hidden' });
+
     expect(await page.screenshot()).toMatchSnapshot('tree.png');
   });
 
@@ -30,12 +37,14 @@ test.describe('Mobile', () => {
       `${tmpPath}/${notebook}`
     );
     await page.goto(`notebooks/${tmpPath}/${notebook}`);
-    // TODO: investigate why this does not run the cells in Jupyter Notebook
-    // await page.notebook.run();
 
     // wait for the kernel status animations to be finished
     await waitForKernelReady(page);
 
+    // temporary workaround to trigger a toolbar resize
+    // TODO: investigate in https://github.com/jupyter/notebook/issues/6553
+    await page.setViewportSize({ width: 524, height: 800 });
+
     // force switching back to command mode to avoid capturing the cursor in the screenshot
     await page.evaluate(async () => {
       await window.jupyterapp.commands.execute('notebook:enter-command-mode');
diff --git a/ui-tests/test/mobile.spec.ts-snapshots/notebook-chromium-linux.png b/ui-tests/test/mobile.spec.ts-snapshots/notebook-chromium-linux.png
index 4dd10c34ce..3b05e53703 100644
Binary files a/ui-tests/test/mobile.spec.ts-snapshots/notebook-chromium-linux.png and b/ui-tests/test/mobile.spec.ts-snapshots/notebook-chromium-linux.png differ
diff --git a/ui-tests/test/mobile.spec.ts-snapshots/notebook-firefox-linux.png b/ui-tests/test/mobile.spec.ts-snapshots/notebook-firefox-linux.png
index 2502663206..6edc57d8c5 100644
Binary files a/ui-tests/test/mobile.spec.ts-snapshots/notebook-firefox-linux.png and b/ui-tests/test/mobile.spec.ts-snapshots/notebook-firefox-linux.png differ
diff --git a/ui-tests/test/mobile.spec.ts-snapshots/tree-chromium-linux.png b/ui-tests/test/mobile.spec.ts-snapshots/tree-chromium-linux.png
index 0ea79afbb6..38244f82e4 100644
Binary files a/ui-tests/test/mobile.spec.ts-snapshots/tree-chromium-linux.png and b/ui-tests/test/mobile.spec.ts-snapshots/tree-chromium-linux.png differ
diff --git a/ui-tests/test/mobile.spec.ts-snapshots/tree-firefox-linux.png b/ui-tests/test/mobile.spec.ts-snapshots/tree-firefox-linux.png
index 017ff95b22..d7e8db6959 100644
Binary files a/ui-tests/test/mobile.spec.ts-snapshots/tree-firefox-linux.png and b/ui-tests/test/mobile.spec.ts-snapshots/tree-firefox-linux.png differ
diff --git a/ui-tests/test/notebook.spec.ts b/ui-tests/test/notebook.spec.ts
index 45531ca2fa..3bfbbf095f 100644
--- a/ui-tests/test/notebook.spec.ts
+++ b/ui-tests/test/notebook.spec.ts
@@ -7,7 +7,7 @@ import { expect } from '@playwright/test';
 
 import { test } from './fixtures';
 
-import { runAndAdvance } from './utils';
+import { runAndAdvance, waitForKernelReady } from './utils';
 
 const NOTEBOOK = 'example.ipynb';
 
@@ -99,4 +99,60 @@ test.describe('Notebook', () => {
     // check the short output area is not auto scrolled
     expect(await checkCell(1)).toBe(false);
   });
+
+  test('Open table of content left panel', async ({ page, tmpPath }) => {
+    const notebook = 'simple_toc.ipynb';
+    const menuPath = 'View>Left Sidebar>Show Table of Contents';
+    await page.contents.uploadFile(
+      path.resolve(__dirname, `./notebooks/${notebook}`),
+      `${tmpPath}/${notebook}`
+    );
+    await page.goto(`notebooks/${tmpPath}/${notebook}`);
+
+    await waitForKernelReady(page);
+
+    await page.menu.clickMenuItem(menuPath);
+
+    const panel = page.locator('#jp-left-stack');
+    expect(await panel.isVisible());
+
+    await expect(
+      panel.locator(
+        '.jp-SidePanel-content > .jp-TableOfContents-tree > .jp-TableOfContents-content'
+      )
+    ).toHaveCount(1);
+    await expect(
+      panel.locator(
+        '.jp-SidePanel-content > .jp-TableOfContents-tree > .jp-TableOfContents-content > .jp-tocItem'
+      )
+    ).toHaveCount(3);
+
+    const imageName = `toc-left-panel.png`;
+
+    expect(await panel.screenshot()).toMatchSnapshot(imageName);
+  });
+
+  test('Open notebook tools right panel', async ({ page, tmpPath }) => {
+    const notebook = 'simple.ipynb';
+    const menuPath = 'View>Right Sidebar>Show Notebook Tools';
+    await page.contents.uploadFile(
+      path.resolve(__dirname, `./notebooks/${notebook}`),
+      `${tmpPath}/${notebook}`
+    );
+    await page.goto(`notebooks/${tmpPath}/${notebook}`);
+
+    await waitForKernelReady(page);
+
+    await page.menu.clickMenuItem(menuPath);
+
+    const panel = page.locator('#jp-right-stack');
+    expect(await panel.isVisible());
+
+    await page.isVisible('#notebook-tools.jp-NotebookTools');
+
+    await page.isVisible('#notebook-tools.jp-NotebookTools > #add-tag.tag');
+
+    const imageName = `notebooktools-right-panel.png`;
+    expect(await panel.screenshot()).toMatchSnapshot(imageName);
+  });
 });
diff --git a/ui-tests/test/notebook.spec.ts-snapshots/notebooktools-right-panel-chromium-linux.png b/ui-tests/test/notebook.spec.ts-snapshots/notebooktools-right-panel-chromium-linux.png
new file mode 100644
index 0000000000..d584708382
Binary files /dev/null and b/ui-tests/test/notebook.spec.ts-snapshots/notebooktools-right-panel-chromium-linux.png differ
diff --git a/ui-tests/test/notebook.spec.ts-snapshots/notebooktools-right-panel-firefox-linux.png b/ui-tests/test/notebook.spec.ts-snapshots/notebooktools-right-panel-firefox-linux.png
new file mode 100644
index 0000000000..9ff3a2026f
Binary files /dev/null and b/ui-tests/test/notebook.spec.ts-snapshots/notebooktools-right-panel-firefox-linux.png differ
diff --git a/ui-tests/test/notebook.spec.ts-snapshots/toc-left-panel-chromium-linux.png b/ui-tests/test/notebook.spec.ts-snapshots/toc-left-panel-chromium-linux.png
new file mode 100644
index 0000000000..14a9fb1154
Binary files /dev/null and b/ui-tests/test/notebook.spec.ts-snapshots/toc-left-panel-chromium-linux.png differ
diff --git a/ui-tests/test/notebook.spec.ts-snapshots/toc-left-panel-firefox-linux.png b/ui-tests/test/notebook.spec.ts-snapshots/toc-left-panel-firefox-linux.png
new file mode 100644
index 0000000000..a952731615
Binary files /dev/null and b/ui-tests/test/notebook.spec.ts-snapshots/toc-left-panel-firefox-linux.png differ
diff --git a/ui-tests/test/notebooks/simple_toc.ipynb b/ui-tests/test/notebooks/simple_toc.ipynb
new file mode 100644
index 0000000000..d74f1600cf
--- /dev/null
+++ b/ui-tests/test/notebooks/simple_toc.ipynb
@@ -0,0 +1,65 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# part 1"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## subpart 1"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## subpart 2"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# part 2"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# part 3"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.5"
+  },
+  "vscode": {
+   "interpreter": {
+    "hash": "0508733a7f73e6ddc798c911e704189485d436785f398d29dd8c20885fc63cb3"
+   }
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/ui-tests/test/smoke.spec.ts b/ui-tests/test/smoke.spec.ts
index 9895ed5d4c..c9e944eac4 100644
--- a/ui-tests/test/smoke.spec.ts
+++ b/ui-tests/test/smoke.spec.ts
@@ -72,7 +72,7 @@ math.pi`);
 
     // Shut down the kernels
     await tree2.click('text="Running"');
-    await tree2.click('text="Shut Down All"');
+    await tree2.click('#main-panel button :text("Shut Down All")');
     await tree2.press('.jp-Dialog', 'Enter');
 
     // Close the pages
@@ -89,9 +89,10 @@ math.pi`);
     await page.goto(`tree/${tmpPath}`);
 
     // Open JupyterLab
-    await page.menu.clickMenuItem('View>Open JupyterLab');
-
-    const lab = await page.waitForEvent('popup');
+    const [lab] = await Promise.all([
+      page.waitForEvent('popup'),
+      page.menu.clickMenuItem('View>Open JupyterLab')
+    ]);
     await lab.waitForSelector('.jp-Launcher');
     await lab.close();
 
diff --git a/ui-tests/test/utils.ts b/ui-tests/test/utils.ts
index e48bd08c92..46b258e42d 100644
--- a/ui-tests/test/utils.ts
+++ b/ui-tests/test/utils.ts
@@ -32,4 +32,5 @@ export async function waitForKernelReady(
     }, true);
     return finished;
   });
+  await page.waitForSelector('.jp-DebuggerBugButton[aria-disabled="false"]');
 }
diff --git a/yarn.lock b/yarn.lock
index 206d12e1fd..4cb5e3043f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1429,10 +1429,10 @@
     "@jridgewell/sourcemap-codec" "^1.4.10"
 
 "@jupyter-notebook/application-extension@file:packages/application-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/application" "^7.0.0-alpha.5"
-    "@jupyter-notebook/ui-components" "^7.0.0-alpha.5"
+    "@jupyter-notebook/application" "^7.0.0-alpha.6"
+    "@jupyter-notebook/ui-components" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/celltags" "^4.0.0-alpha.14"
@@ -1450,7 +1450,7 @@
     "@lumino/widgets" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/application@file:packages/application":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/coreutils" "^6.0.0-alpha.14"
@@ -1465,7 +1465,7 @@
     "@lumino/widgets" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/console-extension@file:packages/console-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/console" "^4.0.0-alpha.14"
@@ -1473,7 +1473,7 @@
     "@lumino/algorithm" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/docmanager-extension@file:packages/docmanager-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/coreutils" "^6.0.0-alpha.14"
@@ -1483,26 +1483,26 @@
     "@lumino/algorithm" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/documentsearch-extension@file:packages/documentsearch-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/application" "^7.0.0-alpha.5"
+    "@jupyter-notebook/application" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/documentsearch" "^4.0.0-alpha.14"
     "@lumino/widgets" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/help-extension@file:packages/help-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/ui-components" "^7.0.0-alpha.5"
+    "@jupyter-notebook/ui-components" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/mainmenu" "^4.0.0-alpha.14"
     "@jupyterlab/translation" "^4.0.0-alpha.14"
 
 "@jupyter-notebook/lab-extension@file:packages/lab-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/application" "^7.0.0-alpha.5"
+    "@jupyter-notebook/application" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/coreutils" "^6.0.0-alpha.14"
@@ -1513,9 +1513,9 @@
     "@lumino/disposable" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/notebook-extension@file:packages/notebook-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/application" "^7.0.0-alpha.5"
+    "@jupyter-notebook/application" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/cells" "^4.0.0-alpha.14"
@@ -1527,7 +1527,7 @@
     "@lumino/widgets" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/terminal-extension@file:packages/terminal-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/coreutils" "^6.0.0-alpha.14"
@@ -1535,10 +1535,10 @@
     "@lumino/algorithm" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/tree-extension@file:packages/tree-extension":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/application" "^7.0.0-alpha.5"
-    "@jupyter-notebook/tree" "^7.0.0-alpha.5"
+    "@jupyter-notebook/application" "^7.0.0-alpha.6"
+    "@jupyter-notebook/tree" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/coreutils" "^6.0.0-alpha.14"
@@ -1555,9 +1555,9 @@
     "@lumino/widgets" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/tree@file:packages/tree":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
-    "@jupyter-notebook/application" "^7.0.0-alpha.5"
+    "@jupyter-notebook/application" "^7.0.0-alpha.6"
     "@jupyterlab/application" "^4.0.0-alpha.14"
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/coreutils" "^6.0.0-alpha.14"
@@ -1575,7 +1575,7 @@
     "@lumino/widgets" "^2.0.0-alpha.6"
 
 "@jupyter-notebook/ui-components@file:packages/ui-components":
-  version "7.0.0-alpha.5"
+  version "7.0.0-alpha.6"
   dependencies:
     "@jupyterlab/ui-components" "^4.0.0-alpha.29"
     react "^17.0.1"
@@ -1813,6 +1813,16 @@
     "@lumino/widgets" "^2.0.0-alpha.6"
     react "^17.0.1"
 
+"@jupyterlab/celltags-extension@^4.0.0-alpha.14":
+  version "4.0.0-alpha.14"
+  resolved "https://registry.yarnpkg.com/@jupyterlab/celltags-extension/-/celltags-extension-4.0.0-alpha.14.tgz#cad83537b31e31910f10099ae260a26aa66a65e8"
+  integrity sha512-S7o/l8n2K5eCnbXCFKsGaOlbl4PnQb10oeRo1PQDQSPAvpN2WgUzp83YYMXlLjngsDs41DGaSBj+7h6qfGCVmw==
+  dependencies:
+    "@jupyterlab/application" "^4.0.0-alpha.14"
+    "@jupyterlab/celltags" "^4.0.0-alpha.14"
+    "@jupyterlab/notebook" "^4.0.0-alpha.14"
+    "@jupyterlab/translation" "^4.0.0-alpha.14"
+
 "@jupyterlab/celltags@^4.0.0-alpha.14":
   version "4.0.0-alpha.14"
   resolved "https://registry.yarnpkg.com/@jupyterlab/celltags/-/celltags-4.0.0-alpha.14.tgz#d1ad45da532c62b0ba1f3778e2feff04d0800698"
@@ -2041,6 +2051,61 @@
     path-browserify "^1.0.0"
     url-parse "~1.5.4"
 
+"@jupyterlab/debugger-extension@^4.0.0-alpha.14":
+  version "4.0.0-alpha.14"
+  resolved "https://registry.yarnpkg.com/@jupyterlab/debugger-extension/-/debugger-extension-4.0.0-alpha.14.tgz#598b6046b40e10e3d811d11ae7b1b2c3611ce031"
+  integrity sha512-K5u32ACz4YNaz2inh+g4mYkUdJTuyAxQSquFvVAImp27oyGKn4GxYrtcHoUCoJlib/0DyDTOg2LOCup6iocMng==
+  dependencies:
+    "@jupyterlab/application" "^4.0.0-alpha.14"
+    "@jupyterlab/apputils" "^4.0.0-alpha.14"
+    "@jupyterlab/codeeditor" "^4.0.0-alpha.14"
+    "@jupyterlab/console" "^4.0.0-alpha.14"
+    "@jupyterlab/coreutils" "^6.0.0-alpha.14"
+    "@jupyterlab/debugger" "^4.0.0-alpha.14"
+    "@jupyterlab/docregistry" "^4.0.0-alpha.14"
+    "@jupyterlab/fileeditor" "^4.0.0-alpha.14"
+    "@jupyterlab/logconsole" "^4.0.0-alpha.14"
+    "@jupyterlab/notebook" "^4.0.0-alpha.14"
+    "@jupyterlab/rendermime" "^4.0.0-alpha.14"
+    "@jupyterlab/services" "^7.0.0-alpha.14"
+    "@jupyterlab/settingregistry" "^4.0.0-alpha.14"
+    "@jupyterlab/translation" "^4.0.0-alpha.14"
+
+"@jupyterlab/debugger@^4.0.0-alpha.14":
+  version "4.0.0-alpha.14"
+  resolved "https://registry.yarnpkg.com/@jupyterlab/debugger/-/debugger-4.0.0-alpha.14.tgz#d9d0c48800b30ec9d083add8bde32cfac8a8c620"
+  integrity sha512-qtewnV9Dfkl2iV9KC911k1LU+Jv9vn7JABvaTM7vZyS8FqVuZ15zigk1HessvRGy657MD5SZoUtpBa4ETcerOQ==
+  dependencies:
+    "@codemirror/state" "^6.0.0"
+    "@codemirror/view" "^6.0.0"
+    "@jupyterlab/application" "^4.0.0-alpha.14"
+    "@jupyterlab/apputils" "^4.0.0-alpha.14"
+    "@jupyterlab/cells" "^4.0.0-alpha.14"
+    "@jupyterlab/codeeditor" "^4.0.0-alpha.14"
+    "@jupyterlab/codemirror" "^4.0.0-alpha.14"
+    "@jupyterlab/console" "^4.0.0-alpha.14"
+    "@jupyterlab/coreutils" "^6.0.0-alpha.14"
+    "@jupyterlab/docregistry" "^4.0.0-alpha.14"
+    "@jupyterlab/fileeditor" "^4.0.0-alpha.14"
+    "@jupyterlab/notebook" "^4.0.0-alpha.14"
+    "@jupyterlab/observables" "^5.0.0-alpha.14"
+    "@jupyterlab/rendermime" "^4.0.0-alpha.14"
+    "@jupyterlab/services" "^7.0.0-alpha.14"
+    "@jupyterlab/shared-models" "^4.0.0-alpha.14"
+    "@jupyterlab/translation" "^4.0.0-alpha.14"
+    "@jupyterlab/ui-components" "^4.0.0-alpha.29"
+    "@lumino/algorithm" "^2.0.0-alpha.6"
+    "@lumino/commands" "^2.0.0-alpha.6"
+    "@lumino/coreutils" "^2.0.0-alpha.6"
+    "@lumino/datagrid" "^1.0.0-alpha.6"
+    "@lumino/disposable" "^2.0.0-alpha.6"
+    "@lumino/messaging" "^2.0.0-alpha.6"
+    "@lumino/polling" "^2.0.0-alpha.6"
+    "@lumino/signaling" "^2.0.0-alpha.6"
+    "@lumino/widgets" "^2.0.0-alpha.6"
+    "@vscode/debugprotocol" "^1.51.0"
+    react "^17.0.1"
+
 "@jupyterlab/docmanager-extension@^4.0.0-alpha.14":
   version "4.0.0-alpha.14"
   resolved "https://registry.yarnpkg.com/@jupyterlab/docmanager-extension/-/docmanager-extension-4.0.0-alpha.14.tgz#dd31c98e924c12d44ced652410e09451bded155b"
@@ -2795,6 +2860,17 @@
     "@jupyterlab/apputils" "^4.0.0-alpha.14"
     "@jupyterlab/translation" "^4.0.0-alpha.14"
 
+"@jupyterlab/toc-extension@^6.0.0-alpha.14":
+  version "6.0.0-alpha.14"
+  resolved "https://registry.yarnpkg.com/@jupyterlab/toc-extension/-/toc-extension-6.0.0-alpha.14.tgz#706e5c2f7abf72546592dea5f675c55dc257bcea"
+  integrity sha512-ilksYGjsXszgdhl9beZtFRmRJLm+ZN2lQ0WJDxsnRaNG+d6tRfiw8toAS111bbSmxyfRNBysdqNIbtNfbioFEg==
+  dependencies:
+    "@jupyterlab/application" "^4.0.0-alpha.14"
+    "@jupyterlab/settingregistry" "^4.0.0-alpha.14"
+    "@jupyterlab/toc" "^6.0.0-alpha.14"
+    "@jupyterlab/translation" "^4.0.0-alpha.14"
+    "@jupyterlab/ui-components" "^4.0.0-alpha.29"
+
 "@jupyterlab/toc@^6.0.0-alpha.14":
   version "6.0.0-alpha.14"
   resolved "https://registry.yarnpkg.com/@jupyterlab/toc/-/toc-6.0.0-alpha.14.tgz#6fad008f8252cbdcd87921ade3c4f42fbfd46012"
@@ -3735,6 +3811,21 @@
   resolved "https://registry.yarnpkg.com/@lumino/coreutils/-/coreutils-2.0.0-alpha.6.tgz#77279303fc72932e3131a085dcaa34e808a09739"
   integrity sha512-W0qqJZoPRHscHL5k/DHSOea7LugPVx7DmART925bdrD8PU1Rw4K0mUzKb/Zsin4m1O5IMBoPuGEdEG5Jhq3KyA==
 
+"@lumino/datagrid@^1.0.0-alpha.6":
+  version "1.0.0-alpha.6"
+  resolved "https://registry.yarnpkg.com/@lumino/datagrid/-/datagrid-1.0.0-alpha.6.tgz#90364797ab0cc7cdb60b72b6448462d56e07219c"
+  integrity sha512-dwQvaEzka8DBbaHHi/HHtzI4sW+U0iX/RgBFfOlFQWtprZfV+Rjeaw2TWPmXPiR/ugy8zGBYhwxPigfR4zO2Kg==
+  dependencies:
+    "@lumino/algorithm" "^2.0.0-alpha.6"
+    "@lumino/coreutils" "^2.0.0-alpha.6"
+    "@lumino/disposable" "^2.0.0-alpha.6"
+    "@lumino/domutils" "^2.0.0-alpha.6"
+    "@lumino/dragdrop" "^2.0.0-alpha.6"
+    "@lumino/keyboard" "^2.0.0-alpha.6"
+    "@lumino/messaging" "^2.0.0-alpha.6"
+    "@lumino/signaling" "^2.0.0-alpha.6"
+    "@lumino/widgets" "^2.0.0-alpha.6"
+
 "@lumino/disposable@^2.0.0-alpha.6":
   version "2.0.0-alpha.6"
   resolved "https://registry.yarnpkg.com/@lumino/disposable/-/disposable-2.0.0-alpha.6.tgz#ccb899b7b4ad6db359c351fe2b2ba989977b06a7"
@@ -4559,6 +4650,11 @@
   resolved "https://registry.yarnpkg.com/@verdaccio/ui-theme/-/ui-theme-6.0.0-6-next.48.tgz#23bbc8037bf9e1b27600f5160a0ff716982db48b"
   integrity sha512-1jls+cpfEXqXc1ZzqLGGNs6YCyG6B6QwDCezEkSvgKm+9A49FnSJ2n2dNIGcQYOszwHmd8EvwN98OEIx3Bbtrw==
 
+"@vscode/debugprotocol@^1.51.0":
+  version "1.57.0"
+  resolved "https://registry.yarnpkg.com/@vscode/debugprotocol/-/debugprotocol-1.57.0.tgz#f055c0422b1f77358a12b1415623099ba0541647"
+  integrity sha512-eww0WhAtj3lPX7+7tGkxQ3P7IRC3hS7+SVL7fmM8CAat2DMM+PVjg1FQbTCtMw6EwNSmT/qMx1iZCyzQguJJKA==
+
 "@webassemblyjs/ast@1.11.1":
   version "1.11.1"
   resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.11.1.tgz#2bfd767eae1a6996f432ff7e8d7fc75679c0b6a7"