If you haven't set up a standard account for your child, you can either do that and log into their account, or choose from these options: If you're setting a passcode while logged in to your administrator account, an alert explains that you should do this from a standard account and turn on File Vault for your computer. Learn how to set, change, or remove a Screen Time passcode on your Mac If you're a parent, use this feature to set up enforceable content, communication, and privacy limits for your child.
Set a passcode so that only you can change Screen Time settings and allow more time when app limits expire.