What does the Transparent header option on a page do?

It makes your header float over the top of the page's first section, with no solid background. A full-width banner then runs right up to the top of the screen, with the logo and menu sitting on the image.

To use it:

1. Go to Content → All Pages and edit the page.
2. In the Layout box, tick Transparent header. The option is hidden if No header is ticked.
3. Click Save changes.

The first section on the page must be a hero or banner. Check that your menu text stays readable over the image, and use View ↗ in the builder to see it live.