Hello @cezareluke,
Thank you for using Hestia and for reaching out!
I took a look at the website and there is nothing wrong with the functionality. All the menu items are displaying, the problem is that there are too many thus the menu goes lower than the viewport. If you change the size to 80% you can see all items.(screenshot).
There would be 2 solutions to your issue:
1) Remove the sticky header attribute. This way, your navbar will remain at the top and users could continue scrolling down ultimately revealing the last categories in the sub-menu.
2) Re-design the menu so there are not as many sub-categories. I saw you have a categories sidebar appearing on each category, thus you could have only one sub-menu to “Abbigliamento Inglese” that would lead to a default category. Then users could chose from the Cateogry Sidebar on the left the rest of the cateogries.
Ultimately there is not a problem with the functionality of the theme itself, but more an implementation difficulty. Of course you are free to choose any of the above options or implement your own custom one.
Thank you for your understanding and please let us know if there is anything else we can help out with!