Hi Bee,
Thanks for clarifying what you’re looking for here. Another option is to export the attendees list to a CSV file, from which you can sort the list in different ways (including the order ID). However, just to make sure we’re on the same page here, the attendees list should be grouped by the order by default (see screenshot). Will this work for you?
If not, I would definitely recommend posting a feature request over in our Feature Ideas Forum! This is what we use to gauge user interest in new features and help guide future development efforts. If you have any questions, please let me know.
Thanks,
Jennifer