This article explains how to move apps from the App Library to the home screen on your iPhone, including how to find an app with Spotlight and then add it to your home screen.

To move apps to the Home Screen (or back on the Home Screen) from the App Library, search the app name > long press the apps icon and select "Add to Home Screen." ...

A big part of the iOS 18 update is the new home screen experience. You can finally place apps and widgets wherever you want on the screen, have dark mode icons, and even use tinted app icons.

If you've always wanted big, label-less icons on your home screen, iOS 18 finally makes your wish come true.