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Open 'Settings' (Bottom row, right)

Scroll down and press 'General'

There, scroll down and press 'Restrictions'

Enter a desired 4-digit passcode of your choosing

Success! Disable and re-enable apps of your choosing. All settings and preferences stay stored, the app itself only gets hidden from the iPhone/iPad.
Here you can also disable in-app purchases and enable parental controls. Enjoy!