It's still a regular window, so it's possible, the only difference is missing button for it, which according to Tudor was removed purposefully.

http://forum.world.st/GT-Playground-Inspect-window-menu-tp4782020p4782044.html

On Fri, Jan 30, 2015 at 12:10 PM, stepharo <stepharo@free.fr> wrote:

Le 30/1/15 11:20, kilon alios a ��crit :
Do you want to hear the irony , I only use Workspace to create a window group to act as a container for Playgrounds :D
 D