You will find the corresponding option inside

Navigate to Dashboard → Fashion Buzz → Typography

You will find the following options:

Body Typography: Allows you to change body typography font family, font weight, font size, line-height.
Menu Typography: Allows you to change Menu font family, font weight, font size.
Sub Menu Typography: Allows you to change Sub Menu typography font family, font weight, font size, line-height.
Heading Typography: Allows you to change Heading typography font-family, font-weight.

Add New Custom Font: Allows you to add a new custom font using google font.