Menu links to mega menu do not work

sc15newweb

Hi

I tried to create a menu similar to the one in this video tutorial: https://www.youtube.com/watch?v=lXBgzjDgwuM&t=285s

The only difference is that I first click on the hamburger icon in the header template and then an overlay menu (sidebar template) opens, where I then find menu items that should be linked to the Mega Menu. 

Although I have assigned the Mega Menus to two navigation points under Design > Menus, no mouseover of the entered Mega Menu appears. Nothing happens when I click on it either.

What could I have done wrong? Can I send you access to the WordPress dashboard?

Is there an easier solution in BeTheme if you want to build an overlay menu with two columns, where the left column is the main menu and the right column displays the submenu belonging to the main menu item when you hover and click?

Thank you and kind regards, jan