If you have the luxury of two monitors, and wish to dedicate the full size of your monitor to the graphics window, enabling your model tree to "Float" may be right up your alley.
If you find this grayed out "Display as separate window" check box as frustrating as I did; you will be pleased to hear this simple solution.
This check box is only available to toggle when you have closed all windows except the base window.
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I remember seeing these settings in early Creo 1.0 but Creo 2.0, with a fresh open, I only get this:
