You can change font, font size,
font style, font color, and fill color for any object in the diagram using the
toolbar.
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To customize the default formatting options for newly created objects, select Windows -> Preferences from the menu. You can also set default options using the context menu. Right-click on an existing object and select “Set appearance default.” New objects in the same diagram of the same type will have exactly the same appearance as the existing one used as the default.