Change Screen Time Downtime preferences on Mac
Use the Downtime pane of Screen Time preferences to schedule time away from the screen. During downtime, only apps that you choose to allow and phone calls are available.
To change these preferences on your Mac, choose Apple menu > System Preferences, click Screen Time, then select Downtime in the sidebar. If you’re using Family Sharing, choose a family member from the pop-up menu in the sidebar.
Turn downtime on or off:
Set up a schedule for downtime:
Block at Downtime
Select this option to block a child’s device during downtime. When the device is blocked, the child can ask for more time.
This option is available only when you’re using a Screen Time passcode. See Change Screen Time Options preferences on Mac.