In short, when you have set Duplicate these displays option in Settings, Windows 10 simply displays the content on the primary display on the secondary display. Important: If the context menu is not appearing with Set for monitor 1 and Set for monitor 2 options, it’s because the second monitor is being used to duplicate the primary display. And use Set for all monitors option if you prefer the same wallpaper for all monitors. Obviously, depending on the number of monitors, Set for monitor 3 or Set for monitor 4 options will appear in the context menu. If you click Set for monitor 2 option, the selected wallpaper will be set as desktop background for the second monitor. Use Set for monitor 1 option is to set a wallpaper for the primary display. Since I have connected only one monitor to my Windows 10 laptop, the Settings app displaying only Set for monitor 1 and Set for monitor 2 options.

If you want to set a new picture as desktop background for a monitor, click the Browse button to browse to the picture which you want to set as wallpaper for one of the monitors, click Choose picture to add it to Choose your picture section (this will also set the picture as wallpaper for the primary display), right-click on the picture now (see picture below) and then click Set for monitor 1, 2 or 3. Step 2: Here, under Choose your picture section, right-click on a picture which you want to set as desktop background for one of your monitors to see a context menu and then click Set for monitor 1, Set for monitor 2 or Set for monitor 3 option. Step 1: Right-click on the empty area of desktop and then click Personalize option to open Settings app and navigate to Background section. Set different wallpapers for each monitor via Settings

Windows 10 slideshow multiple monitors