darktable: I have begun using this app. One question, how are unwanted fill rolls removed from 'collect images'. There are several fill rolls I created from folders that I no longer want to keep in darktable. How can I delete these? I can see nothing!
There is indeed no remove button for film rolls in darktable; according to the program's developers, this is a feature, not a bug.
You can remove a film roll, however, by opening the roll, selecting all photos in the roll and clicking 'remove' under 'selected image(s)' in the right-hand toolbar. This will remove those photos from darktable's database but not delete the photos from your file system (if the latter outcome is desired, click 'trash' instead).