Hello,

Please stretch the section in each HTML block for the full-width menu: https://gyazo.com/d65ccb3e7bfce936d12ca2f551ca341a and set the boxed content width.

Please add this code to the Theme Settings > Custom CSS > Global:

body .wd-dropdown-menu.wd-design-full-width {
    padding-top: 0;
}

You may need to add a padding-top to each section and it is as per your needs.

Best Regards