Steps to reproduce:
1) Enable "guest" user
2) Navigate to login page.
3) Login as guest using username field. (Remember me for 30 days - should be checked-in)

4) As master user navigate to Report->Audit log page.

Result:

And we can't change it back from Zabbix UI. guest user doesn't has Auto-logout field.

Expected:
1) Adding auto-logout field to guest user.
2) Ignoring "Remember me for 30 days" for guest user.