A heading can be entered in the Heading field in the General tab. This can be linked and the size of the heading can be adjusted, as well as hidden as an orientation aid in the backend. This option is identical for the Text, Text & Media, Text & Images, Images only etc. elements, for example. The heading sizes at a glance:

• Layout 1: h1 font: 32px nunito_extrabold
• Layout 2 (standard): h2 font 24px nunito_extrabold
• Layout 3: h3 font:18px nunito_extrabold