You can find the Search Results Page option in the Customizer on Appearance → Customize → Page → Search Results Page
Customize Content Header
The Content Header is in the Page Header is the horizontal bar that sits directly below the menu header and have flexible options above content.
- Page Header Layout: Container or Full Width.
- Display: choose to show just below the header or above the content horizontally with the sidebar or hide the page header of the page.
- Elements: Here you can show or hide and arrange the elements in the page header.
- Align: align.
- Background image: there are 3 options.
- Global: use general settings.
- Custom: use separate settings for search pages.
- Custom style: custom color, background color, padding…Image background only applies when selected as custom.
Customize Content / Sidebar
- Sidebar layout: there are 2 main sidebars left and right, and 6 display layout.