Edit: Does it make a difference that I'm using MC 26 for Mac rather than for Windows?
I don't think so, but someone better versed in both would need to clarify.
I don't know what I'm doing wrong? I insert a DVD and use the Import tool.
Don't import. Just insert and let MC see the disc.
Are you familiar with
view creation at all?
I'm pretty sure that MC only needs to see the disc. It will then add the disc to its CD database. This is generally not seen. To see the contents of your CD database, create a new view, on the root of the tree, and the "set rules for file display" should only contain ~d=c
Add pane categories for (at least) media type and volume name.
Your view could also, if you wanted it to, show combined results from the 'main' database and the 'CD' database. If you tried to play something from that resultant list that was on disc, MC would prompt you to insert said disc.
Once you've figured out how you want the results presented to you, you can tweak the view as you see fit by adding more filters to the "set rules for file display" setting or adding different panes to the view. Volume Name is kind of essential for this view though.
-marko.