If you do not want to show previously used desktop backgrounds in Personalization, or want to delete last used wallpapers, here is how you can remove Wallpaper History in Windows 10.
Remove Wallpaper History in Windows 10
By default, Windows Settings Panel shows a total of five wallpapers if you open Personalization > Background window. It includes four previously used wallpapers and the current one. Whenever you change the wallpaper, the last one gets removed from that list. Now, if you want to get back all the default wallpapers in that location to change the desktop background quickly, here is a simple trick.
To get started, open Registry Editor. For that, press Win + I, type regedit and hit the Enter button. Alternatively, you can search for regedit in the taskbar search box and click on the result.
After opening the Registry Editor, navigate to the following path-
After opening Wallpaper , you will find four different values named BackgroundHistoryPath1, BackgroundHistoryPath2, BackgroundHistoryPath3 and BackgroundHistoryPath4 on your right-hand side. These are the four previously used wallpapers in that last.
You need to right-click on them and delete them one by one.
Let’s assume that you want to delete the 1st and 4th wallpapers. In that case, delete BackgroundHistoryPath1 and BackgroundHistoryPath4.
Whenever you delete an existing wallpaper, it gets replaced by default Windows 10 wallpaper.
Hope this works for you.