With this feature, you can create typography sets that you can then use from other Global and Element options. A typography set included the Font Family, a backup font, the variant, the font size, line height, letter spacing, and text transform. There are five default sets, Headings, Subheadings, Lead, Body, and Small, but you can rename these and create new sets as needed.
This feature will be partficularly useful on new sites. Here you can define the visual style of your typography sections, and then apply them to various other options, including the H1-H6 Headings, Body Typography and even Font options in Elements. in this way you can style your typography across the site in a way that if you make changes to your typography sets, theose changes ripple across the whole site.
For more details on this feature, please see the How To Use Global Typography Sets In Avada.