There are some really good video tutorials from the developers on Vimeo: vimeo.com/album/3062024/video/107563922
The intro describes collapsing panels to save space at [3m 35 secs] and shows the panels collapsing and expanding in the most delightful way.
But... I have clicked and combined keys, checked the menus, looked in the help files, and searched this forum but cannot find out how to do it.
What's the secret?
Cheers.
RPJ