Change Communication Limits settings in Screen Time on Mac
Use Communication Limits settings in Screen Time to limit communication with others. Limits apply to phone calls, FaceTime, Messages and iCloud contacts. Communication to known emergency numbers is always allowed.
To change these settings on your Mac, choose Apple menu 
in the sidebar. (You may need to scroll down.) Click the Family Member pop-up menu and choose a family member (if you’re a parent/guardian in a Family Sharing group), then click Communication Limits.
Open Communication Limits settings for me
Option | Description | ||||||||||
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During Screen Time, Allow communication with | Choose who the family member can communicate with during allowed screen time.
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During Downtime, Allow communication with | Choose who the family member can communicate with during downtime.
Note: The available options vary, depending on the current settings for allowed communication during screen time. | ||||||||||
Allow contact editing | Let your family member edit their contacts in the Contacts app. Turn this option off to prevent them from editing their contacts. | ||||||||||
Manage [family member’s] iCloud Contacts | Request to view and manage your family member’s iCloud contacts.
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Contacts | Manage your family member’s iCloud contacts. Note: You won’t see this option unless your family member has accepted your request to manage their contacts.
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and 
to modify the list.