@Olaf. Thanks for posting.
As with any template, styles can clash. It’s up to the site developer to adjust the css of either the template or the extension to make things display correctly.
I have not released a Joomla 4 compatible version of Easy Folder Listing Pro, so I can’t speak to how the extension works with the casopedia template. If you need support regarding how to adjust the css to work with your template, I can help with that as long as your subscription is active, but I would have to see the site to make any suggestions.