Hi,
The view is controlled by the jD Layouts. In this case it is the Downloads Layout
There are many articles on layouts see
https://www.jdownloads.net/index.php?option=com_content&view=category&id=34As an outline go to Components - then select Layouts. Next select the Downloads tab. See which oneis the Active one (Yes in the Active column). Do NOT edit this one but select it by clicking on the Layout Name. when it opens use the the Pulldown in the Save & Close to use the Save & New. Set the Title to say 'My Download Layout' and Save.
If you scroll down you will find the information block - this usually starts with
<div class="jd_content_wrapper {featured_detail_class}" style="">
and ends with the matching </div> - the normal following comment is <!-- download preview -->
Save & Close. After it is closed find the layout and set the tick-box before its name in the list.
Then under the Actions puilldown click on Activate You can the see the result in the front end (need to reload front end).
The picture showing type of Dwnloadable file is generated by the placeholder {file_pic} usually in the 4th or fifth line.
Colin