Hello,
Here is an example – https://gyazo.com/dfb268d04443dea42d4b0a5a29454a15 > https://prnt.sc/kZhYPEUS5irq > https://prnt.sc/bT3DyZSzTmyd https://prnt.sc/ZYnOUTycTgZD
Read more here – https://xstore.helpscoutdocs.com/article/27-mega-menu (in videos WPBakery was used to create static blocks, but you are using Elementor, so do not activate WPBakery, and use Elementor)
Regards