Open Settings
Tap Screen Time
Tap Content & Privacy Restrictions
Enter your Screen Time passcode if prompted
Tap Allowed Apps & Features
Turn off Safari
If Safari does not appear there, go back to the Home Screen
Touch and hold the Safari app icon
Tap Remove App
Tap Delete App
Confirm by tapping Delete
If Delete App is not available, Safari cannot be fully removed from iPhone
To hide Safari, turn it off in Screen Time instead