Hi Hylke!
Thanks for reaching out to us!
First, I want to apologise for the delay in our response. We’ve been having a higher demand than usual in our forums for the last week. That with some unexpected changes in our team has lead to some delay.
Let me help you with that.
To accomplish that, you would have to make a customization to the single-event.php template file located at /wp-content/plugins/events-calendar-pro/src/views/pro/photo/. We have a great article that will get you started on customizing our templates here > https://theeventscalendar.com/knowledgebase/themers-guide/
I hope that helps! Let me know if you have any other questions and I’d be happy to help 🙂
Best,
Victor