How to see all apps on ios at once, and manage!

Go to Settings>General

Go to General>Usage

You can see all of your apps from this screen. Even those in folders!

By clicking on it, you can see it's size & data, if it has any. Also you can delete it with the press of a button.

This feature is great if certain bugs cause apps to take up space on a device, yet it isn't showing up on the homescreen. Simply delete it and re-install!