I can't logout from Minecraft Beta and I don't want to re purchase it.

I recently joined the Minecraft beta testing and now when I want to logout from it I can't, instead it says if I want to leave I have to reinstall it, which will cost me money. This is from Pocket Edition affecting Android 10 . Please help I don't want to reinstall it, and if not then, please say how can I get rid of the stuff on the top of my screen, like the server or something like that.
It would be great if the support gets back I need help please guys.
Version:- 1.16.201.6