Inserting font family notation in the Theme Designer allows you to then apply these fonts across your theme, and use them consistently across page and space design.
Theme Press Control Panel > Theme Tab > Content > Fonts > Choices > Font Families
fontFamily1: "<font name 1>", "<font name 2>", "<font name 3>";
fontFamily2: "<font name 1>", "<font name 2>", "<font name 3>";