Customizing how OmniGraffle behaves with the General preferences
The General preferences are accessible by choosing Preferences from the OmniGraffle menu.
Startup Select Open documents which were open the last time you quit if you'd like OmniGraffle to remember your open documents.
Select Create new document if nothing else is open to start with a new document when you aren't making OmniGraffle remember open documents, or if there were no open documents the last time you quit.
New Documents Select Show Template Chooser to be presented with a window for choosing a template every time you create a new document. Select Use Template, and choose your default template, if you'd rather bypass the chooser. Either way, you can always get to the template chooser with the Template Chooser command in the File menu.
Text Editing Decide how you would like the Return and Tab keys to behave while you are editing an object's text. Whichever way you choose, you can hold Option while pressing the key to do the reverse instead.
Selection Small objects get smaller versions of the handles that appear when you select them; if you really like the small ones, you can click Always use small selection handles to see them all the time.
When you click in the middle of a shape object that isn't filled with an image or color, you might want to select the object or you might want to select whatever is behind it. Use the Click through objects with no fill checkbox to indicate which you prefer.
Help Tags When you move or resize an object, a little help tag appears to let you know the object's new location and size exactly. That is, unless you find it annoying and turn it off here.
Backup OmniGraffle can periodically save a backup of your files as you work on them; if something unfortunate happens you can then recover some of your work.
List Sidebar If you're accessing OmniGraffle objects with AppleScript, or you're otherwise endeared to unique IDs, you can select Show object identification numbers to add a column to the list sidebar.
Preferences Reset button Each preference pane has a Reset button in the lower left. Clicking this button returns all of the settings on the pane to their defaults. To reset all settings on all preference panes, hold Option while clicking the Reset button.