In KDE, for example, to switch to desktop editing mode, you need to press the keyboard shortcut Alt+D, E, but no matter how much I try, nothing happens.
I tried to press this strange Alt+D, E in all ways and in all sequences, but still nothing happens..
Some of such shortcuts are documented here: https://docs.kde.org/stable5/en/plasma-desktop/plasma-desktop/shortcuts.html
I cannot see Atl+D, E there. But when I right click on the desktop, I see it is assigned for entering editing mode.
You hit it the following way:
It even works for me when I wait several seconds after Alt + D.