I can open multiple repositories at the same time in the same screen. I actually forked from QGit becuase I was missing a lot of functionality and inactivity in the UI.
I couldn't find a way to do that in QGit and GitAhead at least. I didn't try the others.
I actually use Guitar, but GitQlient is also installed on my PC.
[0] https://github.com/soramimi/Guitar