All of my apps in a particular category do not appear on my Home Screen even though I did not delete them how to add back?
How to recover apps that are not appearing anymore
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Use App Library to search the app you are looking for, see this Apple article:
Organize the Home Screen and App Library on your iPhone
Organize the Home Screen and App Library on your iPhone - Apple Support
If you have find the apps, tap & hold on the app, then drag to the Home screen & drop it.