You will find the corresponding option at:
Dashboard >> Appearance >> Customize >> Sub Header
You will find the following options:
Sub Header Height (px): Allows you to set the height of subheader in pixels.
Header Image Background Color – Allows you to set the background colour of the header image section. Note that this will only reflect if there is no image.
Header Image Overlay Color – Allows you to set the image overlay colour.
Header Image Text Color – Allows you to set the text colour of the header image section.
Enable Breadcrumb – Allows you to enable or disable the breadcrumb option.
Page Header – Allows you to enable/disable page sub-header at single post type pages.
Enable Header Image – Allows you to enable/disable sub header image at single post type pages.
Sub Header Image – Allows you to select page header image for single custom post type page.
Switch Header Image With Featured Image – This will show post featured image on top header section at single post page and featured image will be removed from post content.