There are several views from which you have to create menu items, because you should assign the specific modules to them. It is necessary to create a menu item for one of the following views - "Discover", "Categories", "Category" or "Details".
IMPORTANT! You should create only one "Discover" page because the system will not work properly.
For example:
If you have menus "Top" and "Main", you can create an item "Discover" only for one of those menus. After that, you should display those menus by a module "Menu".