Adjusting tempo fonts and sizes, you have to go to Font Style and then adjust, in separate categories, Immediate Tempo, Metronome Music, Metronome Text, and Gradual Dynamics. This would be a lot easier if all of these options were in one place in a single Tempo category.
You could create a separate font and then use that font to be the Parent font of all tempo fonts.
From the manual:
Parent
Allows you to choose a parent font style from which the selected font style inherits settings. Activated options override the parent style settings.
See the top-right of the Edit Font Styles dialog:
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