Does the header support boxed layout?
Divi Widget Header, LocalBiz, & GardenBiz – with all the customizer options, are only fully supported in full-width layout.
You are able to use boxed layout without the sticky navigation if you add a little extra CSS in your divi theme options custom css panel.
margin-left: auto !important;
width: auto !important;
This will give you a full length navigation bar in boxed layout without a sticky menu (menu does not float down in boxed mode, select option for “static” only