Top menu displays vertically with Cassopeia

Hello, 
I have attached the settings of the advanced and mobile menu. The hamburger menu doesn't appear with the Cassiopeia template. It displays vertically. Any idea why?
Thank you

Hi
give me the url of the page so that I can check the problem
CEd

ok, email received
you are using the "metis menu" layout which is not made in the same way as the standard layout unfortunately

in the menu class field, add " nav", and tell me if the mobile menu is activated