Please see this video:
How to Turn On Mirrored Photos in Booth.Events
Follow these steps:
Launch your event
Open the event you want to adjust on your iPad.
Open the in-event menu
While your event is running, place two fingers on the screen and hold them there until the in-event menu appears.
Go to Camera Settings
From the in-event menu, tap Camera Settings.
Select “Photos Not Mirrored”
Scroll through the list of settings until you find Photos not mirrored. Tap it to turn on the mirror effect.
Confirm the change
A message will appear asking you to read and accept flipping the photo. Review the message, then confirm to apply the change.