Try these checks in Windows 11, in this order:
- In Settings > Personalization > Background, check Personalize your background.
- If it is set to Windows Spotlight, change it to Picture and select the image wanted.
- If using multiple monitors with one wide image, set the fit option to Span.
- In Settings > Personalization > Themes, if an active theme is applied, switch to the default Windows theme.
- Then go back to Background and set the preferred image again.
- In Settings > Apps > Installed apps, check whether Bing Wallpaper is installed.
- If it is installed, uninstall it, because it can keep changing the desktop background.
- If the background keeps reverting after restart or sign-in, turn off background/theme sync:
- Go to Settings > Accounts > Windows backup.
- Turn off Remember my preferences for personalization.
- This prevents a synced theme from overwriting the local background.
- If the problem started after creating new images and Windows keeps forcing one of them, the theme/background cache may be corrupted.
- A common fix mentioned in Microsoft Q&A is clearing the cached theme files and then setting the background again.
- After that, reapply the desired background from Settings > Personalization > Background.
- If the background changes every few minutes, also confirm that slideshow is not selected unless that is intended.
- In Settings > Personalization > Background, choose Picture instead of Slideshow.
If the issue is specifically that Windows changes it after about 5 minutes, the most likely causes in the available guidance are:
- Windows Spotlight enabled
- an active theme reapplying a background
- Bing Wallpaper installed
- personalization sync restoring an older or different background
References: