The Font Style settings page, located in "Appearance → Portus Management → Style Settings → Font Style" is for configuring website's font style. You can configure following settings:
|Main Titles & Menus Font||
Change the font for main titles & menus.
Change the font for paragraph text.
|Font Character Sets||
If there is content that needs a specific character set you can enable it here: Cyrillic Extended, Cyrillic, Greek Extended, Greek, Vietnamese, Latin Extended.