The website header is an important part, it takes care of the website menu, title and your logo image.
The page header is optimised for mobile devices. It should be as simple as possible. Advanced menus can hardly be used on mobile devices due to small factor screen sizes.
The headers menu is on the left side of the builder page. Extend the menu and use it.
Your website is responsive mobile first design. More than 60% of today browsing comes from mobile devices.