Please follow the given steps to configure About Section:

• Go to Appearance> Customize>Homepage Settings>About Section
• Check Enable About Section to display it on the homepage
• Select a Page for About Section.
  • The title of the selected page will be displayed as the section title
  • The content of the selected page will be displayed as the section description.
• Select a post/page for About Section.
  • The Featured Image of the selected post will be displayed under the About section
  • The content of the selected post will displayed under the section.
• Click Publish.