Inspectors menu

Show/Hide Inspectors
Make the current inspector arrangement visible or invisible.
Workspace
Save Workspace... — Store your current inspector arrangement for later retrieval. Each workspace you save appears at the bottom of this submenu and has a hot key assigned to it.
Edit Workspaces... — Rename or delete your saved workspaces here.
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.
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 Style: Text inspector. If you have something selected on the canvas, the font you choose here is applied to it.