To change the font style of your site pages, go to:
Site > Branding > Font Family/Set Your Own Font Pair
Select your desired font family and click "Save."
Refresh the page to see the font style changes. All of the default font styles across all pages will be updated in one go. However, if you have made manual changes to the font block text on specific pages, those modifications will be preserved and not affected by the update.
Zenler provides default font sets that work well together, but you also have the option to set your own font pair.
Different fonts may offer various font style options. For example, selecting "Oswald" provides font style options such as light, extra light, regular, medium, semi-bold, or bold.
Also, watch the video on 'Adding Your Own Font Style to Pages'