@pinkmoon
I don′t know if you solve this. What I did was to create a widget area in place of the main nav. Then you can style it up https://www.designchemical.com/blog/index.php/tutorials/wordpress-tutorial-create-your-own-custom-mega-menu-styles/
I’m not sure if that is the best way to do it… but that’s where I got so far. Any ideas? ??