Windows 10: My surface pro screen is mirrored or duplicated to a bigger Dell monitor. The display used...

My surface pro screen is mirrored or duplicated to a bigger Dell monitor. The display used to cover 100% of the Dell monitor, the display became smaller with two black borders on the left and right only. How to fix this please?

:)

 

When "Duplicate these Displays" is selected, external monitor displays upside down, but not the Surface Pro screen

After Windows 10 updates were automatically installed last night, my LG external monitor displays upside down when "Duplicate these displays" is selected under Display settings. With other options (Extend these displays, or Show only on 1, or Show only
on 2) the external monitor shows the correct orientation. PC is Surface Pro 3 with Windows 10 Pro operating system. LG monitor is 34UM95-p 34" Ultrawide IPS Monitor. Ctrl-Alt-Up or -Down do not work. Drivers are up to date. Thanks in advance
for help/suggestions.

 

DELL S2340T Monitor not detected Surface Pro 2 / Windows 10

Hi Shug,

I suggest you to refer the link below and follow the troubleshooting steps suggested.

Trouble connecting Surface to a second screen?

Troubleshoot connecting Surface to an external display - Microsoft Support

Connect Surface to a TV, monitor, or projector

https://www.microsoft.com/surface/e...ce-to-a-tv-display-or-projector?os=windows-10

Do let us know if you are able to connect to dell external monitor. Thank you.

 

Miracast mirroring different resolution screens

Hello, I’m investigating using my Surface Pro 3 as an external touchscreen monitor mirroring the main monitor of my system.
When I set it up, it was quite nice to use the Surface to touch navigate my much bigger main monitor.
Unfortunately, my monitor is 4K and when set to mirror the Surface Pro3, it drops down to the surface’s resolution which is about half that.

Is there any way for the monitors to mirror while keeping the 4k monitor at full resolution?