To set different desktop backgrounds on Windows 10, navigate to Settings > Personalization > Background, then right-click the ...
and select the Set for all desktops option to set one wallpaper on multiple displays. Change the primary monitor in Windows 10 To change the primary monitor in Windows 10, select the number ...
After adding the source of wallpaper, click the OK button ... You can adjust the placement from here if the monitors are not placed correctly. Two more options for Superpaper are equally important ...