@ Jürgen Joost
I’m assuming this is in regards to the Slim Plus template, correct?
It is possible, but you would have to edit the template in order to show the categories assigned to the entry.
You can add the categories to the
card.php file by adding this where you want them to be displayed:
$entry->getCategoryBlock( array( 'separator' => ', ', 'before' => '<span>', 'after' => '</span>' ) );
card.php file can be found in this folder:
I recommend following the method in this QuickTip so you can add it in an update safe way.
Hope that helps!