Pro does not display the featured images

Most of my posts have a featured image. In Journal Clean there are displayed well. Clean Journal Pro though does not display any featured image. How can I show the images also in the Pro version? In addition, I have to display the featured images captions. In my functions.php the functions clean_journal_entry_meta and clean_journal_single_content_image will be overrided, and the captions are displayed. The reason is, that in Germany the captions must be visable because of the copyright notice necessity. Is there another way to display the image captions?