Cannot Mirror Display

[AlbanRampon]

Good afternoon,

I imagine you are using Windows 10.

That operating system already has excellent support for extended displays in it and it wasn't duplicated.

Simply right click on the desktop and select display settings.
You can then choose which screen to clone to which.
Here is a Windows 10 forum describing how to do this with any display over any graphics adapter.

If the option is not available there, then you graphics card doesn't have adequate Windows 10 drivers and you would either need to use the Windows inbox driver, or get a new driver from your graphics card vendor.

Kind regards,
Alban