In the Customize menu there is a selection for the headings font and another setting for the subheading font. According to the Boldgrid page, https://www.boldgrid.com/support/boldgrid-easy-seo/introduction-to-seo-content-and-structure/ the header font should be H1 and all other H2, H3, etc. headings are subheaders. The problem is that the header font is applied to all of the “H” tags (H1, H2, H3, H4). The subheader setting has no influence at all.