How to expand / collapse a folder in the Files panel

[lestephane]

There is an arrow down icon next to folders, and I've also seen it change to an arrow pointing right, although I don't remember how I did it. I cannot find any documentation on the actual shortcut to collapse (arrow right) and expand (arrow down).

[mark2185]

Try <Enter>.

Also there's ` if you want to flatten it all.