Appearance >> Customize >> Typography Settings >> Header Font Size Options – Section
From this option, you can change the font size of header. Please check the following instructions about header font size.
- Site Title Font Size – This font family is use to site title of header branding sections.
- Site Description Font Size – This font family is use for Tagline of header branding options.
- Primary Navigation Font Size – This font size for Main Navigation of header. This is first level menu size.
- Primary Sub Navigation – All fonts size for primary sub menu. This font size for Main Navigation sub menu of header. This is for all level except first level menu.