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Description
On openSUSE KDE/Plasma, you can click the 'sleep' button in the start menu. It breaks the GUI in a bad way that means you need to adjust your browser size (it ends up looking like you've zoomed into a 15x15px square somewhere on the screen, until you change screen size a few times). I haven't been able to find a way to disable that button - 'sleep' doesn't turn up anything in https://develop.kde.org/deploy/kiosk/keys/
Maybe there's something useful in the Plasma documentation?
On openSUSE Gnome, pressing the logout button takes you to a login screen that you can't get back from unless you reboot the machine.