Open an app, then triple press the side button (right-side).
For iPhones with a Home button, open an app then quickly triple press the Home button (at the bottom).
Using your finger, circle areas of the screen to disable.
Tap Options (lower-left).
Tap the switch(es) to turn the following on or off then tap Done:
The options presented may vary.
Hardware Button (Always off when Guided Access is enabled)
Tap Start (upper-right).
If prompted, to 'Set Passcode':
Enter a passcode.
To end a session for iPhones without a Home button, triple press the side button, enter passcode then tap End (upper-left).
For iPhones with a Home button, quickly triple press the Home button, enter passcode then tap End (upper-left).
To remove previously set restrictions from an active session:
Quickly swipe up from the bottom of the screen.
For iPhones with a Home button, triple press the Home button.
Enter 4-digit passcode.
Tap the X symbol next to any areas of the screen that have been disabled.
Ensure the desired option switches are turned on then tap Done.