This article explains how to hide App Store and iTunes purchases using Family Sharing on iPhone, iPad, and iPod touch devices with iOS 11 and later, and Macs with macOS 10.13 or later.
how to share app purchases with family sharing
The Family Sharing feature built into Apple devices makes it easy for everyone in the family to download free music, movies, TV shows, books, and apps purchased by other family members. However, there may be purchases that you don’t want to share with everyone.
Luckily, any family member can hide their purchases in Family Sharing without having to remove the people you’re hiding them from. Here’s how to do it:
Open the App Store app.