In Windows 11, the lock screen wallpaper can be found in the Settings app. Navigate to Settings > Personalization > Lock screen to view or change the wallpaper. You can choose from Windows Spotlight, a single picture, or a slideshow. The images can be stored in C:\Users\[Your Username]\AppData\Local\Packages\Microsoft.LockApp_cw5n1h2txyewy\LocalState.
