With Guided Access, you can temporarily restrict iPad to a single app. This can be useful when you let a child use your iPad or when you want to stay focused on a task. You can set a time limit, and customize which features, hardware buttons, and areas of the screen are available.
Circle any areas of the screen you want to disable. Drag the mask into position or use the handles to adjust its size.
Tap Options, then turn on or off any of the following:
Top Button
Volume Buttons
Motion (to prevent iPad from switching from portrait to landscape or from responding to other motions)
Software Keyboards
Touch
Time Limit
Tap Start.
Depending on the passcode options you chose when you Cognitive accessibility features on iPad