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I have started using OmniGraffle, primarily for brainstorming, in conjunction with OmniFocus for GTD and Outliner for project planning. I have been using the Circles template, along with the helpful auto arrangers, as a mind map.

However, the default canvas size is quite small for spreading trees of items, which are also very large and by default at size 18. How can I set the default for size and font when I create a new document?