This theme comes with two different types of headers. If you go to the theme options > header settings you can see all the settings available for customize the header of this theme.
You can select any header type globally form here. You can upload logo for the transparent header.
Header style ( header background , color, margin, padding ), menu style ( background, color, width ) can be adjust from here.
This theme support add custom item to menu, you can see in the demo login menu item is highlighted, You can set those custom menu item form here the header settings.