1
Open the Settings App.
Go to System - Display.
Ensure the Scale Percentage and the Resolution is set to the entries labelled (Recommended).
2
If that does not resolve the problem, if you are using a PC with an external monitor, press the menu button on the bottom of your monitor to bring up the on-screen menu and try using the Aspect Ratio or Autofit setting to get the full image on your screen.
3
If you are still unable to resolve the problems, I need some details about your system
A
Right click your Start Button and open Device Manager.
Expand the Display Adapters section, please provide a screenshot of that full Device Manager window.
B
If you are using a laptop, what is the make and exact model number of the laptop.
Or if you are using an external monitor on a PC, on the back of the monitor is a label, what is the make and exact Model number of the monitor.
C
Please provide a screenshot of the Settings - System - Display settings window.