thank you for your anwer.
Problem is that mega menu looks like this : http://2016.lesforeziales.fr/wp-content/uploads/2016/08/mega-menu.jpg
And classic menu like this : http://2016.lesforeziales.fr/wp-content/uploads/2016/08/menu-2.jpg
I don’t want the columns, I just want the classic menu (in lines) but with each item on one line only. For example on the second image, “Organisation de seminaires et reunions” is on 2 lines.
Moreover, I want add the blue lines between items, like in the mega menu but in lines and not in columns.
Is it possible ?