Situatie
If your Mac has multiple users, you should set up an account for each person so each can personalize settings and options without affecting other users. You can let occasional users log in as guests without access to other users’ files or settings. You can also create groups and choose automatic login options. You must be an administrator of your Mac to perform these tasks.
Both standard users and administrators can join network account servers.
To change these settings, choose Apple menu 
> System Settings, then click Users & Groups 
in the sidebar. (You may need to scroll down.)
Solutie
Pasi de urmat
For Users:
View the list of users. Click the user picture to change it.
Click the Info button 
next to a user name to view details and make changes.
Turn on the Guest User account to allow occasional users to log in.
For Groups:
View the list of groups.
Click the Info button next to a group name to view details and make changes.
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