On our testbead/sandbox WordPress multisite server (version 4.4) I have
installed (and update to most current) the Vantage theme and Page Builder.
The Documentation at https://siteorigin.com/vantage-documentation/customizations/menu/ says in part:
To adjust the menu colors, navigate to Appearance > Customize > Theme Design > Menu. Set the color by clicking on the “Select Color” button next to each setting respectively.
But when I go to Appearance > Customize there is no “Theme Design” to select.