Hi Corinna,
Thanks for reaching out!
The remaining tickets should actually be shown by default in the list view (see screenshot). Is this not the case for you? You can add in the remaining ticket count to any of your templates by adding the following PHP:
<?php echo 'Tickets left: ' . tribe_events_count_available_tickets(); ?>
First, you’ll want to copy the template you’re editing into your child theme by following these instructions, then you can add the PHP above.
Please let me know if you have any questions!
Thanks,
Jennifer