This menu is mostly used for simple one-page scrolling website and you can see it on the right side in your page backend editor. It might be selected by default when you install the demo data. This menu type is available in our themes, which have been built with WPBakery Page Builder. You may check this post to see how to set a one-page scrolling menu with metabox menu.
This is the primary menu, which you add your menu items from Appearance > Menu. If you’re using one of our WPBakery Page Builder themes, please make sure the default primary menu type is selected.