FWIW: the font for the CodeView (CV) panels are set in Edit->Preferences->Editor settings, the font for the Preview (PV) panel is set in Edit->Preferences->Editor settings. They can differ e.g. I use Consolas for CV and Liberation variants for PV
IIRC: the calibre viewer will use the embedded fonts, if they exist; and if they don't, the fonts set in the viewer's Preferences->General->Font options settings are used.
BR
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