Hello! Basically, I have a problem using Direct3D 9 display mode. I once fixed it for a few days, but then the issue came back. And it is not happening in just one project, it happens in every my game. But, when I build the game and open the .exe file, it works fine without problems! I could ignore it and build the game whenever I add something new and want to try it out, but that would just waste my time. My friend told me it is an issue with my PC, and it probably is, but if someone knows how to fix it, please answer.

Showcase of the issue itself: https://drive.google.com/file/d/1TlBXTifH9ruI0oIwjemexUp2Tf0KsBzu/view?usp=sharing

And yeah, as you can see, there's this gray square appearing all over the screen. I have an effect that covers all the screen, but it is not the problem, cause, again, this issue occurs in all my projects where I use Direct3D 9.