It does not work quite yet. Here is the specific info from their FAQ
Hiding the theme’s menu
To hide the theme’s menu, you’ll need to find the appropriate class or ID to hide. The easiest way to do this is to use the Chrome Developer Tools – right click on the theme’s menu and click “Inspect Element”. Look up the DOM tree for the nav or div that is wrapping your menu’s topmost ul, and use the ID or class from that element to hide the menu.
If you need to hide multiple menus, you can comma-separate their selectors. For example, .top-menu, #main-menu. This works just like a normal CSS selector, and that is how this setting will be used by the plugin to hide the targeted elements.
Please let me know if you have any further thoughts or ideas.