Typography customization is related to the font family and font sizes.
This section includes body font family and heading font family option.
Click on Dashboard>Appearance> Customize> Typography Customization
Start selecting font family of body and heading
In this part, you have to select font family for body text.
Click on Body
Click on scroll down button and select font family
In this part, you have to select font family for header text.
Click on Heading
Click on Scroll down button and select font family