Besides using a menu on top of every page, sometimes you may want to place in other positions, for example, on the sidebar. And using widget is a smart way to do this. Fortunately, Ninja Menus by Magezon supports widget that gives you the ability to add menu in any position. We'll show you how!
https://www.magezon.com/magento-2-mega-menu.html

1. Go to Content > Elements > Widgets and click Add Widget.
2. In Settings section, choose NinjaMenus Menu for Type field and your current theme in Design Theme field. Then click Continue button.
3. In Storefront Properties tab, you can specify where to place your menu in Layout Updates section.
4. In Widget Options tab, enter Title and choose your desired menu by clicking on Select Menu... button.
Remember to save after you finish the settings.