Enable per booking check in.
This can be accessed from the navigation bar in either the Activity Tour or Activity Bookings pages - a pop up will appear to check in multiple bookings at once.
This can also be configured as a swiping action on bookings on the Activity Tour page. (configured as left side swipe action by default)
Scroll down to the bottom of an Activity Tour → click on either the right of left side swie → Select “Booking Check In”
This is configured on the left side swipe by default!