Hey Dylan,
Thank you for reaching out to us! At this moment there is no feature to change the number of columns in Photo View.
If this is something you want to see implemented in future releases, I would recommend casting a vote in our Feature Ideas here:
https://tribe.uservoice.com/forums/195723-feature-ideas/suggestions/16732288-photo-view-with-2-columns-instead-of-3
To help you get started, the layout is created using the Isotope Script, then we run a script to initialize Isotope on that page:
events-calendar-pro/src/resources/js/tribe-events-photo-view.min.js
Non-minified Version:
events-calendar-pro/src/resources/js/tribe-events-photo-view.js
So to change the formatting you can wp_dequeue_script the first script and then replace it with your own.
Unfortunately, that is the only way to get this done right now and it is beyond the support we can provide to do this customization, but I can assist if you have further questions in the mean time.
Regards,
Patricia