How do I switch users in KDE?

According to https://bugs.kde.org/show_bug.cgi?id=427777 it should be possible to switch users from the KDE lock screen, however I don't seem to have this functionality. Related question: is it possible to have two different DEs on different virtual consoles (if necessary with two distinct users)? For example, one with KDE and another with Gnome. I know this used to be possible in some previous iterations of KDE/Plasma, but there may be limitations due to SDDM. poc