App

Try this:

Move an app from App Library to the Home Screen:

You can add an app in App Library to the Home Screen, unless it’s already there.

Touch and hold the app, then tap Add to Home Screen (available only if the app isn’t already on the Home Screen).

The app appears on the Home Screen and in App Library.

Find your apps in App Library on iPhone - Apple Support

Any help by clicking in the link below?

Move apps and widgets on the Home Screen on iPhone - Apple Support