Guided Access is an iPad feature that uses a passcode to lock your iPad in our app, ensuring your visitors can't close the app or access anything else on your iPad.
To activate this feature you can follow Apple's instructions here, making sure to set your auto-lock settings to "never" as well to ensure the best outcome.
Once those steps are complete, open The Receptionist app and triple-click the Home button to begin your Guided Access session.
The app can additionally support autonomous single app mode (such as JAMF, PRO, MDM, orASAM). Press and hold the top middle of the screen for a few seconds to get to the secret settings menu:
Within that area, there is a button that will attempt to enable ASAM labeled "Guided Access" to help most standard users, but when you tap it, it will enable ASAM.