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How do I change my user picture on Mac without photos found?
In Photos preferences, check that your library is set as the System library. If the button is grayed out there, then it is already set. You can drag a photo onto the user picture, too. Don't click on Edit, just drag an image file onto it.
How do I change the PFP on my Macbook?
in the top-right corner of the window, then click iCloud Settings. Click Change Apple ID Photo, then do one of the following: Drag an image file onto the photo.
