Changing the heading styles can help transform your site with a new look. Heading styles are applied to all the major headings throughout the site, such as blocks, pages, standings, results, etc.
To change the heading style you have to visit the customizer. Find Customize in the sidebar or from the dashboard, once in the customizer, select Profile Styles, and then see the Heading Styles dropdown.
When you make a selection it will reload the view of your site with what it will look like with the new styles.
Once you are happy with your choice, hit publish and this will apply the changes to your site!