Disable them how ? If you mean hide the App Store and/or stop in-app purchases being done go to Settings > Screen Time > Content & Privacy Restrictions on the phone.
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
Disable app purchases
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.