Hello,
i've been having this problem for a long time now but since im polishing everything in my game to prepare for a test build for my game testers i've decided to finally fix this.
I own an 21:9 monitor but my game doesnt support that resolution and im too far in to just "add it". Afaik i've never made any changes to this, but im able to draw beyond these borders. The game itself renders correctly.
the 0,0 point is also correctly set. with it being the top left if it were a 16:9 monitor.
i've added two pictures of how it looks right now and how it should be.
thanks in advance :D