When I login as guest, then change the background, logout, and log back in, the background is not saved. How can I choose which background the guest account will have?
MacOS – How to change the Guest account’s background image
guest-accountmacos
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Best Answer
This article explains it very nice. Basically you are modifying a "User Template" file, which is used to create a fresh new user every time you log in as a Guest. If you're not quite sure on how to do it just ask for help. :)