It's called Lively Wallpaper. For most people, Lively Wallpaper might just be good enough to manage your wallpapers, and you might not need the large repository of options available in Wallpaper ...

Lively Wallpaper is a free application that one can install from the Microsoft Store and use to set webpages as their wallpaper. Not just webpages, it also allows users to set other applications ...

It comes with the Lively Wallpaper tool and is free of charge. If you want to switch back to the standard background, select X Active Backgrounds in the menu bar at the top and then click on the X ...