Font default

This is a very dumb question, but how can I establish a default font (Garamond) and size for all my texts.I suspect this has something to do with templates, and I notice that there is a new template command, but how can I convert an existing and rather large project with a variety of fonts and column widths to a single default? Thanks

OK, I answer my own question. I can see there is a way of setting a font default in options/editor, but that seems to work only on new fonts. What I’m looking for is something that will retroactively put all my files already in the system, hundreds of them, into a single font and format. Scrivener allows me to reset everything to default values, but that looks a bit irrevocable. Thanks

Brilliant. It works lke a charm. Many thanks.