Full Screen in Vertical mode with 55 inch Ark Monitor

Good afternoon to all.
I am using a 55 inch Samsung Ark Monitor in portrait mode. It is like having 3 32 inches monitor, one on top of the other. I leave my Brave Browser window open in the bottom part of the monitor. When going full screen, like a youtube video, the image is centralized, with big black bars on the top and bottom of the video. Is it possible to make the full screen align the image with the bottom part of the screen?
Thank you very much for your help and all the best.

Igor