Sound of a demo patch is completely different in an editor

Doug_Dye1

Just downloaded Labs for Apple MainStage today, it sounds pretty cool. I have a basic beginners question. For example, I auditioned the Siren Songs patch on the website. Great sounding patch, quite complex with subtle movement. But when I open it in Mainstage, it’s nothing like that. It’s like all the elements of the patch play separately as different patches, and there’s no obvious way to combine them to create the sound from the demo.

I might be missing something very basic here, but how can I open this patch (for example) and have it sound like the demo?

Thanks for the help!