Can't change the resolution of the game

The native resolution of my screen is 3072x1920 and it affects performance in a quite negative way (first screenshot). If I try setting a lower resolution, e.g. 1920x1200 (which is the closest one to the Full HD according to my aspect ratio), Apex makes itself smaller on the screen leaving black field around (second screenshot. I was able to catch it only using a camera). Surfing forums hasn't helped me. Setting a lower resolution of the OC doesn't make a change as well.