Windows 11/10 via its Settings allows you to easily set different wallpaper on different monitors in a dual monitor setup. As of now, it is possible to set different pictures as the desktop ...

Here's how you do it. Set a Wallpaper in the Settings App on Windows 10 To change desktop backgrounds individually for each ...

Dual monitors ... select the monitor you want, and click the dropdown next to Use as to set the display mode. You can decide whether to extend or mirror your Mac desktop across multiple monitors.