You added class vertical-menu

to top level menu - it's correct

You added the same class to child items - it's wrong, delete it.

I just want to say like can you make a video like how to make vertical mega menu just like you have made a video for that columned mega menu .

Because i am not able to understand what you have written so that i make vertical mega menu 

Provide me details, which problem do you have with understanding? What did
you try and what did you get? Send screenshot of actions which you did,
please.

Hi,

I am planning to use vertical mega menu but not able to understand how i can setup the way you have explained cause me to confuse Like where to put what. So overall can you give me an example so that i can able to make vertical mega menu http://rehubdocs.wpsoul.com/docs/rehub-theme/basic-settings/mega-menus/#Vertical_Mega_menu