Tap Allowed Apps and then turn off Safari. This prevents your child from downloading apps that may be inappropriate for the age. Under Allowed Content section, tap Apps and then tap the age range for your child for example, 12+ or younger. This prevents your child from removing apps, including Norton Family. Under the Allow section, turn off Deleting Apps.
On iOS 12 and above, turn on Content & Privacy Restrictions. You need to create or enter a 4-digit restrictions passcode. On iOS 11, tap Restrictions and turn it on. On iOS 12 and above, tap Settings app > Screen Time > Content & Privacy Restrictions.