Cannot switch user from lock screen any more
In current Fedora 34, with gnome-shell-40.0-1.fc34.x86_64 , it no longer seems possible to switch user from the lock screen. Previously - this seems to have broken between 40beta-1 and 40rc-1 - after you opened the system menu and clicked "Power off / log out" on the lock screen, "Switch user" was available there. Now it isn't. So if a multi-user system is locked by one user, another user cannot switch to their session unless the logged-in user unlocks their session first, it seems.