Thanks so Much. That did the trick.
For the sake of anyone else who finds this thread:
The file that I edited can be found here:
events-calendar-pro/src/resources/js/tribe-events-photo-view.js
All I had to do was to replace line 76 of the code with:
layoutMode: 'fitRows',
fitRows: {
I also deleted the minified version of the file so that this change would take affect.