The autocomplete function is not going to be controllable and in any case is the least clever way of getting your font applied to text.

Better ways might be:
Create styles and apply those instead
Choose a Document Theme which lists Calibri for headings and body text
Do a Ctrl-A and apply the font once instead of lots of times
Run a macro to update the font properties of all styles

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Andrew Lockton
Chrysalis Design, Melbourne Australia