You can find the Page Header option in the theme Customizer on Appearance → Customize → General → Global Page Header .
The Page Header is the horizontal bar that sits directly below the menu/header and have flexible options above content. It contains the page/post title text, as well as a tagline. You can design attractive Page Header area with background color/image to suit your design on each page, post, blog post, category, archive, search or 404 page.
Choose to enable or disable Page Header for the entire site
Background overlay color
Background overlays are typically used for light background colors, or light background images, that use a background overlay to increase contrast with the section text color.
Page Header Styling
Customize the general background color, background image, spacing for the Page Header section.