Recently (finally) realized there was a way to collapse all branches in the sidebar folder tree. Unfortunately it's
left-click, which on Windows does work, but when you release the
alt key you also activate the program menu. In my case, who has that menu hidden, it also makes that menu appear (obviously).
This is rather annoying, because it means for me to collapse the branches I have to do
left-click (collapses tree and shows/activates menu), and then do
alt again (which hides/deactivates the menu).
You should find a different key than
alt for this, and regardless of what key it is, there should also be an option in the
right-click menu and/or maybe a button in the sidebar header.