One of these should do the trick.
If you are just closing the Opus window and then re-opening it later on:
[ul][li]Preferences / Launching Opus / Default Lister / Update Default Lister automatically when closing a Lister[/li][/ul]
If you are fully exiting Opus (or restarting the computer while Opus is running):
[ul][li]Preferences / Launching Opus / Startup / Open the Listers that were open when the program was last closed[/li][/ul]