How do I restore missing App Store icon on iPhone Home Screen iOS 18.3?

For starters, the App Store app cannot be deleted. There could be two reasons for this, you either have restrictions in place or you hid the app.

• Go to Settings > Screen Time > Content and Privacy Restrictions > iTunes and App Store Purchases > Installing Apps and set to Allow.
• Keep swiping left until you reach the App Library, then search for the App Store there and drag it back to your app pages.

Go to the App Library (the last page of the Home screen, search for it, and drag it to where you want it.