1. Open Settings on Windows 11

2. Click on System

3. Click the Optional features page

4. Click the “More Windows features” settings under the “Related settings” section.

5. Click the Windows Sandbox option (if applicable).(Quick note: Turning this feature off may prevent the error 0x800F0825 while uninstalling the KB5063878 update)

6. Click the OK button

7. Click the Restart now button

8. Open Settings one more time after the reboot

9. Click on Windows Update

10. Click the Update history page

11. Click the Uninstall updates setting under the “Related settings” section.

12. Click the Uninstall option to remove the update KB5063878 (build 26100.4946) from Windows 11.

13. Click the Restart now button

14. Open Settings one more time

15. Click on Windows Update

16. Click the “Pause for 1 week” button to disable automatic updates to prevent the system from reinstalling the update.

17. (Optional) Click on System

18. Click the Optional features page

19. Click the “More Windows features” settings under the “Related settings” section

20. Check the Windows Sandbox option to re-enable the feature (if applicable)

21. Click the OK button

22. Click the Restart now button.