Remove extra column from 'Commander' tab

Hello Hollis,

Pardon? The Commander toolwindow is always displayed as two columns. The
whole point of its existence is to easily perform operations which have a
source and a destination in different places (such as moving or copying clases
between packages)/

An errant click/drag bestowed my 'Commander' tab with a second column.
Without nuking all of my other customizations, how do I get back to
the default layout? Is there any good reason to support multiple
columns in the first place?

--
Dmitry Jemerov
Development Lead
JetBrains, Inc.
http://www.jetbrains.com/
"Develop with Pleasure!"