Open the device Settings app
Tap Screen Time
Tap Content & Privacy Restrictions
Turn on Content & Privacy Restrictions
Tap iTunes & App Store Purchases
Tap In-app Purchases
Select Don’t Allow
Enter your Screen Time passcode if prompted
Open the device Settings app
Tap Screen Time
Tap Content & Privacy Restrictions
Turn on Content & Privacy Restrictions
Tap iTunes & App Store Purchases
Tap In-app Purchases
Select Don’t Allow
Enter your Screen Time passcode if prompted