The macOS font palette can be shown either via the Note menu or a shortcut (Cmd+T).
This palette can be used to set only the typeface and size. Other controls such a text colour have no result on text within Tinderbox notes. Bold and italic text are created by using the bold and italic font variants of the regular font in use.
The palette can also be used to set Outline and Map view title font typeface and size, etc.
See also—notes linking to here: