Want Folder to be expanded in Async loading

Load children asynchronously :
Node that defines this function is collapsed by default. At the moment of clicking 'Expand' arrow, it starts loading its children by calling given function.
But I need the node to be expanded, how to change the default option
(https://github.com/OntimizeWeb/o-ngx-tree#load-children-asynchronously)

- As a Beginner in Angular I need support on this