I would like 'recent files' to display only the opened/accessed 'documents'. No music, video, images, ... It was easily configurable on 16.04 but didn't find a way on 20.04.
Unfortunately, there is no control. An issue about this problem was closed, pointing to a location to raise issues on the Settings dialog.
Failing that, you still can quickly filter the recent files by typing a file extension, or some characters of the file name.