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How to Set a Different Wallpaper on Each Monitor in Windows 10
Set a Wallpaper in the Settings App on Windows 10 To change desktop backgrounds ... and select "Set For Monitor 1," "Set For ...
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How to set different Wallpaper on different Desktops on Windows 11/10
You may not be able to extend a single wallpaper. Windows 11/10 via its Settings allows ... and choose Set for desktop > Desktop 1/2/3 or any other number that you may have.