Often people want to know how they can change the default font in Pages. But there is no default font. Instead, when you create a new document you are using a template, often the template named Blank. So if you'd rather start with a different font, then just create a new template that is a variation of the Blank one, and use that template instead.
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I can't figure out how to set line spacing in Pages. Can line spacing be set in Templates?
Betti: In the Format sidebar, click Style, look for the Spacing section.