Inspectors menu
Show/Hide Inspectors — Make the current inspector arrangement visible or invisible.
Reset Inspector Locations — Put all of the inspectors back to where they started, as if you'd just started OmniGraffle for the first time ever.
Style — Show or hide the Style inspector of your choice.
Properties — Show or hide the Properties inspector of your choice.
Canvas — Show or hide the Canvas inspector of your choice.
Document — Show or hide the Document inspector of your choice.
Show/Hide Colors — Summon or dismiss Mac OS X's Colors panel; you can also do this by clicking a color well in an inspector. You can drag color swatches from this panel to objects' fills, strokes, or text, or to color wells on the inspectors.
Show/Hide Fonts — Summon or dismiss Mac OS X's Fonts panel; you can also do this by clicking the Font button in the Text inspector. If you have something selected on the canvas, the font you choose here is applied to it.