How to retrieve missing app on iPhone screen

Hi Jalapenorojo

welcome to the Apple (user-to-user) Community!

Re: "How to retrieve missing app on iPhone screen:

Have to type it in the search screen and app opens. How do I put it back on my screen?"

You might want to search the iPhone App Library for the app that is no longer on the Home Screen. See: Organize the Home Screen and App Library on your iPhone - Apple Support

Eg: says: "From your Home Screen, swipe left until you see the App Library.

Your apps are automatically sorted into categories."

If needed: Tap the search field, then enter the app that you're looking for.

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If you find the app in the Library, you can add the icon back to the Home Screen.

For how to move an app from a folder to the Home Screen.

See: Organize your apps in folders on iPhone - Apple Support

Eg: says:

"Move an app from a folder to the Home Screen

You can move an app from a folder to the Home Screen to make it easier to locate and open.

✽ Go to the Home Screen page with the folder that contains the app,

✽ then tap the folder to open it.

✽ Touch and hold the app until the apps begin to jiggle.

✽ Drag the app from the folder to the Home Screen".

All the best :-)