UI display issues

Hi guys, I need some help here.

I successfully installed Catalina on my Ryzen 7 3800x Rx 5700xt, but I have some UI artifacts and problems with fonts rendering, everything seems pixelated (closing, minimizing window buttons, fonts, buttons...) as if there wasn't any anti-aliasing, and looks like sometimes there is also too much contrast...

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Tried changing resolution through settings: did not work

Tried SwitchResX : partially working but not free

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My config:

Ryzen 7 3800x,

Rx 5700xt,

Asus Rog strix b450-f,

HyperX 32gb RAM 3200MHz,

Samsung 4k 32 inch monitor.

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Hope someone can help me figure this out...