Same 2 drives in dual pane at every startup

I had this OK in DOpus8, but in V9 I just can't find where to select drives C & F so that my C drive is in the Left pane and F is in the Right pane every time I startup DOpus.

I've been at this for over an hour with no success.

Many thanks in advance for any help on this.

Generally Opus 9 should start up looking like it did the last time you closed it which is different from version 8

How are you launching Opus 9? Do you use a specific command?

Set up a lister how you want it, pointing to C and F, then choose Settings -> Set as Default Lister.

thank you both.