At 3:24 of this video https://www.youtube.com/watch?v=S613AhAnOkU Horizontal and Vertical display margins are explained. On PC changing these features actually make a difference in the game. On Xbox changing these have zero effect on your HUD.
I have a regular Xbox One I now use as a media player and a Xbox Series S I use for gaming. I have messed around with horizontal and vertical display margins on both Xboxes. Putting both vertical & horizontal display margin on 100 looks exactly the same on both Xboxes as 0 horizontal and vertical display margin.
So, long story -Yoink!-: 343i please fix this!
Haha! The word S H O R T is considered a curse word! 
