Having used Eclipse for more years than I care to admit, I\'m currently trying to get adjusted to IntelliJ 12 but I\'m having a hard time with the totally different UI metap
Usually setting split on the structure and toggle the windows method that Trillian mentioned above works.
However for the case where it does not, I've had some success with editing the project's .idea/workspace.xml file directly and replacing the lines (with all settings) for id="Project" and id="Structure" from a project that has the window layout I want them into the project that I can't get the layout working correctly.