The game does not run in full screen (Apex Legends)

Good day. To begin with, it turned out that in 2021 I still have a square monitor with an aspect ratio of 5: 4, that is, my resolution is 1280x1024. So, entering the game Apex Legends, I have black stripes at the top and bottom. The thing is that in the game settings there are my aspect ratios and screen resolutions, and what's even stranger is that if I change the aspect ratio and screen resolution to 16:10, where it would seem for my monitor there should be black bars - they are not. , the image is full screen, but stretched that mazolit eyes. In short, in short, black stripes above and below, how to remove them? (Don't offer to buy a new monitor, heh)