Monitor not displaying full screen in Windows 11

If the monitor connected to your PC, whether primary or secondary, is not displaying the full screen in Windows 11/10, these ...
TweakTown

Windows 11 is getting a full-screen Xbox mode that you can boot into

TL;DR: Microsoft aims to create a seamless PC gaming experience on Windows 11, similar to an Xbox console, by partnering with ASUS to launch a new ROG Ally. This version will feature a full-screen ...

Xbox mode is landing on all Windows PCs, bringing a full-screen experience

Xbox mode is rolling out to Windows 11 PCs, laptops, and tablets, bringing a controller-friendly, full-screen gaming ...