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
I love Intellij IDEA, but every once in a while there is some glitch like this. Anyway, here is a key point that you need to know from this writeup:
To be able to see two windows simultaneously, the corresponding windows should belong to different groups, that is, one of the windows should have the split mode off and the other one on
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My problem was I had split mode ON for both the Project Tool window and the Structure Tool window. If one tool window has that mode OFF, and the other ON, that will help them show together correctly. However, this is NOT guaranteed to work, which negatively impacts usability. I have filed a usability enhancement request with our friends at Intellij. I hope others in my situation will help me vote it up: https://youtrack.jetbrains.com/issue/IDEA-144963