1. Have only one session > Kickoff/Kicker/dash/Krunner > Switch User -> you go directly to SDDM where you can start a new session
2. Start a new session, then Switch user again -> you go to the session management screen where you can switch to the other session, or start a new one
Videos:
Clicking "Switch User" when there are no other sessions: {F7264475}
Clicking "Switch User" when there is another session to switch to, and then switching to it: {F7264476}
Clicking "Switch User" when there is another session to switch to, and then starting a new session: {F7264480}
Switching between multiple sessions in the session switcher: {F7264483}
If the fake "New Session" item is shown (e.g in other themes), here's what it now looks like: {F7264485}