Press the Side button or Top button to wake the iPad if needed
Triple-click the Side button or Top button if Guided Access is already enabled
If Guided Access is not enabled, go to Settings
Tap Accessibility
Tap Guided Access
Turn on Guided Access
Open the app you want to freeze on the screen
Triple-click the Side button or Top button
Tap Start
Set a passcode if prompted
To unfreeze, triple-click the Side button or Top button again
Enter the Guided Access passcode or use Face ID or Touch ID
Tap End