Hey Hans!
Welcome back! To familiarize yourself with how our plugin handles custom templates, please review our Themer’s Guide. The file you’ll need to edit/overwrite is /the-events-calendar/src/views/modules/meta.php. Copy line 49 and paste it to line 43 and the ‘Additional Fields’ should appear below the ‘Details’ section.
Don’t forget to save it in your tribe-events folder inside your theme folder ([your-theme]/tribe-events/modules/meta.php) to avoid losing customizations. Please follow our Themer’s Guide when making these customizations ?
Good luck and thank you again for choosing PRO!