lol that isboxer screenshot is completely different from your in game screenshot on your original post
are the minimaps still distorted when using this new layout?
can you post a game screenshot of that?
Also try and force the "Desired rendering size" setting maybe.

in any case, you should still be able to use the in game "Video" setting to change the resolution and try and find out which one matches the main screen better. That might give you an idea of what's going on