How do you edit existing playlists using extGUI4LMS?

I like the capabilities that the extGUI4LMS plug-in adds to LMS for ease of playlist creation but once I create a playlist I don't see a way to open up the contents of an existing playlist and edit its contents. It seems like the contents in the right pane is always the now playing list. Is there a way to show the contents of a playlist and add or delete songs?

Thanks,
Rick