App lock and hide app features is missing from iOS.
Why missing ios device’s applock and hidden app features.
please apple worked this feature.
iPhone 7, iOS 14
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What’s App lock?
As to hide the app, you can remove it from Home Screen and keep access to it from App Library only.
Organize the Home Screen and App Library on your iPhone
https://support.apple.com/en-us/HT211345