Hey Alena, thats a nice problem. ;-)
if you don't want to administrate, make yourself another user account and log in with it.
that would be the easiest way, i would say.
you can deactivate "Shared Session" under Global Configuration->System, then you are not logged in in the front-end, if you have activated shared session at all.
i don't think you will get around not using pb 4 for the future. better get used to the user interface slowly. the worst thing that can happen to you as a developer nowadays is that a tool is not developed further. and that seems to be the case here after the announcements for 3.x.
this is just my opinion. im just a customer, not a team oj Joomshaper.
Best Wishes.