Windows 10 will not display full screen on 23" LG Monitor

Is this a driver issue or a Windows 10 issue? Device Manager says my LG driver is up to date and that the MS display driver is also up to date.
 
Of Course; the borders of the display won't stretch either. It's like the driver thinks the display is 21 inches.
 
I'm talking about going to Control panel>All Control Panel Items>Display & click on Change display settings. I hope this helps.
 
I understand . been there; done that. makes no difference. I think the probleme is a generic microsoft video driver that overrides my ati video card in Windows 10.
 
Nvidia? SLI? I had the same problem. Uninstall your driver(s) and reboot. I let the GeForce Experience install the drivers and it then worked, but that's only for Nvidia. I understand that you have an LG monitor, but what type of GPU?
 
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