SUMMARY When there is only a single user logged in and they choose "Switch User..."; take them straight to SDDM rather than first showing the lock screen's user switcher UI, because there are no other users that can be switched to so it's pointless. STEPS TO REPRODUCE 1. Log in as yourself and make sure there are no user users logged in 2. Go to Kickoff > Leave > Switch User OBSERVED RESULT The lockscreen's user switcher UI is displayed, and the only thing you can do is click on "Start New session". After that, you get taken to SDDM and you can actually choose to log in as another user. EXPECTED RESULT Where you are the only user logged in, you should be taken straight to SDDM. There is no reason to show the lockscreen's session chooser UI since there's only one thing you can do with it when you're the only logged in user. SOFTWARE VERSIONS Everything from git master ADDITIONAL INFORMATION Related: https://cgit.kde.org/plasma-workspace.git/commit/?id=084b9a408cda665328e440c354ca8ef19207d0f6
*** This bug has been marked as a duplicate of bug 386361 ***