WordPress theme with advanced menu.

Hello, i want to make menu on my web like in this web page:

https://themeforest.net/item/wordzine-community-and-magazine-theme/full_screen_preview/40712

As you can see where are categories and subcategories. But in this web page is one big problem. For example i go to category “entertainment” and it shows me 3 subcategories “Celebrities”, “Movies”, “Music”. Ok i press on “Movies” subcategory and i see articles which are in this subcategory. All looks good. But for example go to the article “G.I. Joes HQ: The Pit!” and when i press on it i see the article content, but look at the meniu, the nabigation to whis article is gone… how to fix it ? Because i want to buy maybe this theme and fix the meniu. Or maybe someone have another theme which has the meniu like this. I dont care it is free or i need to buy it. Just tell me if you`ll see. Thanx to all ??