Hi,
If your Windows 11 slideshow keeps reverting to a single picture, start by ensuring your system is fully updated, then restart the Themes service by pressing Win + R, typing services.msc, locating Themes, and restarting it to refresh background handling. Make sure your images are in a standard folder like Pictures and that your user account has full access by checking Properties, Security, and permissions. Then go to Settings, Personalization, Background, Slideshow, and select that folder. If it still jumps back to a single picture, the issue may be a stuck registry setting controlling the slideshow at HKCU\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize, which can be reset by renaming or deleting the key. This approach addresses common causes: system glitches, folder permissions, and corrupted settings that prevent slideshows from functioning.
Kind regards,