Endless Slideshow Screensaver Pro allows you to run photo slideshow only on selected monitors so you can keep working on the others. For example, if you have 3 monitors connected to your PC, you can configure the slideshow to run only on one of the monitors and keep using the other two for other purposes.
By default, Endless Slideshow Screensaver uses all available monitors for the slideshow. This can be changed in the screensaver settings, [ Monitor (display) ] tab.
When you open the screensaver settings window, the list of all monitors connected to your PC is shown in the left part of the window, with the main monitor shown first (you define the main monitor in the Windows Control Panel).
If you do not want your photo slideshow to run on one of the monitors - select that monitor in the list and open the [ Monitor (display) ] tab. Then check the [ Do not run the slideshow on this monitor ] option to disable the photo slideshow for that monitor.
Do this for all monitors that you want to keep outside the slideshow, but be sure to have at least one monitor with the [ Use individual settings ] option checked. You will configure your slideshow only for monitors that [ Use individual settings ]. And here is the article showing how to configure different slideshows on different monitors.
The [ Screen background ] section allows you to select the type of background that is visible only when you configure your slideshow so that the slideshow zones do not fully cover the screen (you can have some space between the slideshow zones as well as some space between the screen edges and your slideshow zones). All background types available in this section are described in the slideshow background article. They work the same but are applied to the entire screen.