Open Settings
Tap Screen Time
Turn on Screen Time if it is off
Tap App Limits
Tap Add Limit
Select the app category or specific app
Tap Next
Set the time limit
Tap Add
Use a Screen Time passcode to prevent changes
Open Settings
Tap Screen Time
Tap Content & Privacy Restrictions
Turn on Content & Privacy Restrictions
Tap Allowed Apps or iTunes & App Store Purchases
Disable apps or purchases you want to restrict
Open Settings
Tap Screen Time
Tap Content & Privacy Restrictions
Tap Content Restrictions
Set age ratings and app restrictions
Open Settings
Tap Screen Time
Tap Always Allowed
Remove apps you want to block during downtime
Open Settings
Tap Screen Time
Tap Downtime
Turn on Downtime
Set the schedule to restrict app use during selected hours