Thanks for the email.
When you say the 'Log out' button I'm assuming you're talking about the 'Leave Self Check-in' button at the bottom?
This is not currently possible. The user is already logged out though, that button is there in case someone needs to log in, such as volunteer who needs to log in to ensure something is set correctly.
Hope this helps,
Yes that is the button I was referring to. Unlike other pages in the self check-in process, that re-auth screen never times out, but can be dealt after 60 seconds of idle with through our kiosk browser instead.