Combining the Item details and the Booking details into a single toggle means I cannot display or hide some of these during different stages of the itinerary.

Item details toggle should split out the Booking details.

The Booking details option sits under the Item details option

And it has the same Custom / Hide/Show options

And the tooltip lists: Confirmation number, Check-in instructions, Note to traveller, Flight number

And the Item details tooltip shows Inclusions, Amenities, Cancellation policy