How to deactivate a menu itself when no files/folders are selected?
A GOOD question! o))
I think, the closest thing would be a floating toolbar with the "auto hide" option activated, if that works for you. Otherwise, there seems to be no option to achieve that.
No way to do that at present.
Would you add it to the feature list, please.
IMO it's an essential design decision not to have selectable buttons while all others are not selectable. It must be uniform.
+1