I am new to GP Premium Add-ons and I had hoped that there is an obvious way to improve the site header layout. I do not really like the default site header that can be set in the customizer. So I deleted the logo and checked both boxes to remove the predefined captions. Then I created a merged page header with a background image and some nicer formatting of the captions. But this seems to be a per page setting and not a site level setting. Is there a menue that does what the page header setting does on a site level?
The Page Header meta box settings are page specific.
One thing you can do is build your header using the Blog page header in Customize > Blog (all of the meta box settings are in there for the blog).
Then you just need to add a filter to make it appear site-wide instead of just on the blog:
add_filter( 'generate_get_blog_page_header','tu_global_page_header' );
function tu_global_page_header()
{
// Show the blog page header site-wide - no conditional needed.
return true;
}