To prevent guests from closing LumaShare app and accessing other apps, you can use different methods depending on your device:
iOS/iPadOS - Guided Access (Recommended)
Guided Access locks LumaShare to be the only available application on iPad and iPhone devices.
Setup Guided Access
Tap Settings > General > Accessibility > Guided Access to set up Guided Access.
From there you can:
Set Guided Access to On
Set a passcode that controls the use of Guided Access and prevents someone from exiting the application.
Set whether the device can go to sleep during a session.
Start a Guided Access session
Open LumaShare.
iPads/iPhones with home button: Triple-click the Home button.
iPads/iPhone with no home button: Triple press the Power button.
Adjust settings for the session, then click Start.
In LumaShare, Open top menu, then tap on the Lock button to lock your settings.
End Guided Access
To end guided access, triple click the home button or triple press the power button same as before and enter in the PIN you setup up under Guided Access.