The custom menu widget displays the menu for a specific page on your website as a widget. It will automatically inherit the main page name and all publicly visible sub menu pages from that the widget is placed in. These links will let you navigate the the page from within the widget. You will still be able to use the main navigation menu at the top of your site in the same way.
To get started click +Add Content
Click on the Menu Widget
In the menu widget setting you can style your menu widget. There is also an option to hide this widget on mobile devices. After making changes and styling your menu widget, click Save.