Hi Jérôme,
Thanks for reaching out!
You can do a customization like this by following these instructions to copy the template for the photo view into your child theme, where you can then edit it. The template for photo view can be found at wp-content/plugins/events-calendar-pro/src/views/pro/photo/content.php. For the individual events that appear in photo view, take a look at the single-event.php template in that same folder, and for the navigation, nav.php.
Please note that we are limited in the amount of support that we can provide for customizations, but if you get stuck or have any questions, please do let me know and I’ll be happy to point you in the right direction!
Thanks,
Jennifer