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The Due view is based on Context mode, so just select View -> Grouping -> By Project from the menu bar while it's active and you'll be all set.

(If you want to make this change permanent in a given perspective, you can use Perspectives -> Save Window As -> <name of perspective>.)

Hope this helps!

Last edited by Brian; 2011-04-19 at 11:29 AM.. Reason: add "while it's active" for increased clarity. :-)