How to full screen?
This issue always happens after upgrading to Windows 10.
On the previous operating system, you’ve got the option to play games very well.
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But the full screen issue occurs after installing an update.
Why is monitor not displaying full screen in Windows 10?
Now, lets go to see some useful solutions.

What should you do when your rig starts but the screen is black?
Here are 8 unique ways to help effectively fix the PC turns on but no display issue.
In most games, there is a full screen mode.
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Just check whether it is enabled.
If not, turn this mode full.
If this solution isnt working for you, go to the next one.

Alternatively, you could clickStart > controls > Systemto enter theDisplayinterface.
Step 3: verify the resolution is set to the recommended one.
As a result, the issue of monitor not displaying full screen Windows 10 happens to your machine.
Step 1: Right-tap on theStartbutton and clickDevice Managerin Windows 10.
Have received the message critical error start menu isnt working?
This post will walk you through some effective fixes for the start menu error.
Is Windows 10 not using full screen?
Try these ways one by one.
Hope it’s possible for you to troubleshoot your PC problem with ease.