You can restrict movie watching based on movie rating by changing the ratings filter of a profile or subprofile and locking it to that device:
- Tap your Profile Pic (settings)
- Select your profile or Switch Profile and Edit on the profile you wish to update
- Slide the ratings filter to define what movies can be viewed and select Save
- Switch to that profile by selecting it
- Select Lock Profile and Continue
NOTE: Subprofiles can only be locked on mobile devices.