Same screen resolution (1024x768 and 1280x1024) (Counter-Strike: Global Offensive)

Hello everyone, guys, I ran into such a problem, I reinstalled Windows, everything is OK, I downloaded the cs again, everything started up
but there is a problem in quality, there is no difference between the resolution of 1024x768 and 1280x1024, it used to be wrong, how to fix this crap?