I’m a new GP user, and running up against some limitations.
Seems like Layouts should be able to control the header along with other standard page sections.
Layouts saved as Elements should be selectable from individual pages, as Layouts are basically a replacement for Page Templates.
It would also be helpful to be able to select Headers in the Layout panel, just as there are sections for Sidebars, Footer Widgets, Disable Elements, and Page Builder Container.
Cheers.
GeneratePress 2.2.2
GP Premium 1.7.8