Regarding your query, the sub-text below the introduction title comes from the content section of the page. The page name renders as the introduction title and content as the sub-text. You can customize easily by following the path Appearance > Customize > FrontPage > Introduction. You can choose the page you want to display by enabling the introduction section.
Thank you for your reply. I still can’t make this work.
I have the text in the content section of the page.
I tried with different pages (even original pages created through demo import) and still can’t have that sub-text.
I also tried having content in classic and block text, still nothing.