Thanks for the answer, Pratham. May i ask for further details. I have a menu set up for the header. And another for the footer, which right now is reflecting (and mirroring) the set up i see imn the header.
Which of these two i need to set up as an advanced one? only the footoer version? or the header version? or both?
Just set the footer one as Advanced. No need to do anything to the header one.
All menus in the Wix Editor are connected to your Site Page list by default. So any menu that you want to edit your way, simply set it to Advanced and then you can customise it your way by adding links, submenus, etc without affecting other menus on the site.