Hello,
Watch this video – https://youtu.be/7QluEYxznKs , in your case it is Elementor, not WPBakery, so enable Elementor for static blocks – https://xstore.helpscoutdocs.com/article/47-static-blocks
Read more about menus here – https://xstore.helpscoutdocs.com/article/27-mega-menu
Let us know if you need any further assistance.
Regards