This is the theme setting for your site Advanced Typography.
Go to Appearance and click Customize. On customize click on ‘Advanced Typography’
You can choose whether to set up advanced setting for your font or not.
Choosing Yes, will drop down options for your Body and Heading font (H1-H6), List, Link, Logo, Blockquote, Main Menu, Sub Menu, Mega Menu and Widget Title Fonts.
You can set your Font Family, Font Size, Line Height, Letter Spacing, Text Transform and color for each Fonts.