Hi Dave,
Try Settings -> Toolbars --> ListerMenu.
You'll then need to drag and drop the ListerMenu to the desired location.
Edit Note:
Duhh....
I guess you can't try Settings -> Toolbars --> ListerMenu, if you don't have the menu.
Right-click the Title Bar of the lister window and select Customize.
Alternatively right-click the Directory Opus icon in the taskbar tray and select Customize.
Select the Toolbars tab.
Check the checkbox for the ListerMenu toolbar.
Press Close.
You'll then need to drag and drop the ListerMenu to the desired location.
Regards,
Zippo