Howdy Christian Jaroljmek,
I would love to help you with this.
Thank you for sharing the past CSS. I can see how that helps a bit even still, but obviously not good enough.
Unfortunately this is now going to need more than a simple CSS fix, it will require a theme override for /event-tickets-plus/src/views/wootickets/tickets.php . We do have a guide for creating these: Themer’s Guide but it will still involve a goodly bit of knowledge on WP Theming to convert the current WooCommerce table into something that can be multiple rows. If you do not have the requisite knowledge you should definitely reach out to the theme author, they appear to already support The Events Calendar so it is quite likely they would be interested in support Event Tickets Plus as well.
I wish I had better news on that front. Please let me know if you have any questions. Cheers!
– Brook