The user can't hide an app in an iPhone but there are modes to make the work easy. You can put the app in such a place that a person cannot approach it.
Use Folders to hide Apps on iPhone
The most direct method for keeping away an application on your iPhone is to go to your Home Screen and make another organizer.
Click on the application you want to hide and hold the icon, from the home screen pick to edit and drag it onto another application.
At last, open the folder and drag that application into another organizer window.
How to Hide Apps on iPhone Using App Library
How to Hide Apps on iPhone Using App Library
Tap on Home Screen and hold onto the application to hide. Then, at that moment, select Remove App from the spring-up menu. At last, tap Remove.