OpenAdmin has auto-logon functionality enabling you to login as any user to their OpenPanel user account.
A little lesser known setting is: impersonate in /etc/openpanel/openadmin/config/admin.ini which if set to 'yes' will display a banner on OpenPanel UI indicating that you are logged in as an administrator from OpenAdmin:

If you wish to disable this, simply edit:
nano /etc/openpanel/openadmin/config/admin.ini
and set impersonate to 'no':
impersonate="no"