disable or delete guest session

hi I had the problem that suddenly a guest session appeared while i was playing in user/accounts settings. i was unable to disable or hide or delete this unwanted user session on my phone and I got confused about it because i serching for a setting in the mainuseraccount for hours …

for each others, who hit upon the same problem.

I could solved it inside the guest session -> systemsettings -> user/accounts -> settings of guestuser
than delete the usersession.