I don’t really know how I did this but some kind of debug menu has appeared.
I’m using Unity 2021.3.22f1.
It shows for all my projects, re-installing the same Unity editor did not fix the issue.
Upgrading to 2021.3.25f1 doesn’t work either.
It doesn’t interfere with the development but it’s annoying and it’d be great if I knew how to hide this.
This is on Windows 11, by the way.
Sorry this was something from GPU Tweak III, which I have forgotten that I installed waaaaay back.
Don’t know how this was enabled, but sorry if anyone had started investigating.