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All UI customizations are at the User level, not System level. If you think about the way an OS is organized, this makes sense. It will also appear if you select Login Window from your profile pic on the upper right menu bar, or Switch User from your lock screen. The System lock screen will appear when you restart a machine with MULTIPLE users because the OS has no idea which user is about to login. It will also appear on restart if you only have ONE user profile.
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This screen appears when lock your computer. This article is about the User lock screen image. There is USER one that you can change, and a SYSTEM one that you cannot (easily). There are TWO lock screen images, which this article does not make clear. type: mv /Volumes/Macintosh\ HD/Big\ Sur\ Graphic.heic /Volumes/Macintosh\ HD/System/Library/Desktop\ Pictures/Big\ Sur\ Graphic.heic type: mv /Volumes/Macintosh\ HD/System/Library/Desktop\ Pictures/Big\ Sur\ Graphic.heic /Volumes/Macintosh\ HD/System/Library/Desktop\ Pictures/Big\ Sur\ ġ5. type: cd /Volumes/Macintosh\ HD/System/Library/Desktop\ Picturesġ4. copy your own grafic image in to Macintosh HDĪttention!!!! X=your Big Sur disk from 'diskutil list'ġ3. name your own grafic image as Big Sur Graphic.heicĨ. Now the Big Sur volume should be writableħ. Found the answer, apparently /System/Library/Desttop Pictures/Big Sur Graphi.heic is where the login screen background loads from.Īttention!!! X=your Big Sur disk from 'diskutil list'