Hi,
It's quite simple to hide a menu item, just move it to a menu that you don't use in a menu module.
For example, when you install HikaShop, it creates a menu "HikaShop default menus" and create pre configured menu items in that menu.
Since that menu is not being displayed by any menu module, the menu items do not appear on the website frontend menus, but they can still be used by HikaShop in some cases.
Also, when no menu item is set for a listing page (which I don't recommend), HikaShop should normally use the default settings configured in the "Display" tab of the HikaShop configuration. Although, for the prices, that setting is also used for the product page display so you don't want to deactivate it.