Fixed in 1345, use Tools > Options > Media Tree

I wasn't able to find a way to hide these nodes, too.
Let's hope it will come with the final release :)
And there should be an option to hide the "UPnP Servers" location at Music - Location (or Audiobook - Location etc.).

I don't see any option to show/hide the following tree nodes

- now playing
- playlists
- upnp servers
- my computer
- net radio
- web

they do not appear on the options > collections page, or collections > tree nodes, or any where else in the options that I could find

http://www.ventismedia.com/mantis/view.php?id=7114