bezels

I just got a new monitor and was checking it out when I saw these black bars on the side, top, and a tiny bit on the bottom. They look like should be part of the screen as if it should fill them in too. They are not part of the bezels. I think I remember seeing this on my old monitor two. My...

Here is the issue I am having View: https://www.youtube.com/watch?v=GjBRNKuCUWQ I rotated the monitor on the right 90 degrees but ever since I rotated the monitor they don't align properly. Monitor on the left is 4k (3840 x 2160) while on the right is 2k (3440 x 1440) On rearrange displays...