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We're planning to offer the option to separate the inspectors from the document window, as I noted in a related thread:

Originally Posted by Ken Case View Post
Integrating the inspector into the main window was one of the design goals for OmniGraffle 6, making it easier to work with OmniGraffle on small laptop screens. Many of our customers have told us they really appreciate this change.

That said, we've also heard feedback from people in this thread that it makes some workflows harder, and we do plan to offer an option in a future release which would let you separate the inspectors from the document window.

But this isn't a trivial change; it's a fairly big undertaking that will be delivered as a feature in a version 6.x major update, not a bug fix for a version 6.0.x maintenance release.