In what scenario should you make a section of the navigation drawer collapsible?
Take a look at the amount of content in the navigation drawer as a whole. If it contains a lot of items, make parent items collapsable so that all/most parent items are visible without scrolling. If the drawer is fairly empty, and most children items are visible without scrolling, don’t make parent items collapsable.
Can I programatically set the state of an menu item to be collapsed?