Hi Kris,
Hope you are well!
I got your issue checked by our Onsite team and they advised that within the event, you need to enable 'Badge Editing' setting to 'On' and this will then allow you to disable 'Badge Preview' option in the kiosk mode setting in the App.
For this, please login to your Cvent event at the backend > go to your event > OnArrival >OnArrival Settings > Edit > scroll down to 'Kiosk Mode - General Settings' section > click 'ON' for 'Badge Editing' > save. Then sync your OnArrival App and you should see the option to disable 'Badge Preview' option.

I hope this helps. Please let us know if you have any further questions.
------------------------------
Raashi Semwal Khati
Senior Quality Analyst
Cvent
------------------------------