This action is available only in iOS 9.3 and above. You can now hide almost all of Apple’s default apps. Due to limitations imposed by Apple, you can not hide the Settings app or the Phone app.
Select apps and click the arrow to move them to the “Hide these Apps” list. To select multiple apps, hold Shift or Alt (Win) or Command (Mac) and click.
You may hide apps that don’t even appear on all devices, including Calculator, Voice Memos, Garageband, iMovie, iTunes U, Keynote, Numbers and Pages.