To open the Resource Browser, choose File ▸ Resource Browser ( Shift-Command-N): The next way to set a default template in OmniGraffle is with the Resource Browser. The next time you create a New Document, OmniGraffle will use your choice of template as the default.
Click to select the desired template, and then click Set as Default.A sheet slides down, providing you with access to OmniGraffle's available templates.The first way to change OmniGraffle's default template is in the General Preferences pane ( OmniGraffle ▸ Preferences ▸ General): One of the most frequent questions our Support Humans receive is 'How do I change the default template in OmniGraffle?', so let's get this one out of the way first.