I can't create drop down menus from pages

Hello

I have been having problems with creating sub-menus from pages on my main page.

my website is http://www.labonnevivante.me

I recently created a post on Viennese Coffee Culture, and I assigned it under Categories: Vienna, Coffee Houses

I went to my destinations page, and wrote a list of different locations (hamburg, vienna, panama). I connected vienna on this list with the link http://www.labonnevivante.me/category/vienna/

I went back to the Menus. Dragged the Vienna category under the Destinations page. I made sure to position it as a sub page. I refreshed my page, and the destination tab still doesnt have a drop down with “Vienna”.

I also changed my theme to the original one to see if it has anything to do with the suits theme, and the destinations tab also didnt drop-down like I wanted to.

It is still possible to click on destinations tab and then click the hyperlink vienna, although aesthetically it would look nicer the other way.

Hope someone can help me with this!!!

p.s. I’ve made sure to assign the vienna category to my post…..