In System Settings' Desktop Session module, it is no longer possible (don't know from which Plasma version exactly) to choose the default action (log out, shut down, restart ...) for Logout Screen. Has the setting been moved? SOFTWARE/OS VERSIONS KDE Plasma from Arch Linux KDE Plasma Version: 5.27.8 KDE Frameworks Version: 5.110.0 Qt Version: 5.15.10
*** This bug has been marked as a duplicate of bug 465584 ***