The question is already very old - but I just had the same problem. The solution was - restart with the Shift key pressed, problem solving, advanced problem solving, restart the device in safe mode - the user list was then available.
Stuck in Windows 10 Kiosk Mode - No way to switch users
Hi,
I was trying kiosk mode and unfortunately did not disable "Use my sign-in info to automatically finish setting up my device after an update or restart". Now the login screen never shows other users. So I have not found a way yet to get back to my computer as myself.
I tried Ctrl + Alt + Del - brings me the login screen, but no list of users to switch to
Shift + Restart - get the troubleshooting screen, still no way to switch users
I even tried "Reset" from the troubleshooting screen - reset keeps failing
Has been a whole day of trial and error to get back to my computer - no luck!