Hi,
I suppose that your products listing is displayed there thanks to a module. In that case, under the "HikaShop options" tab of the settings page of the module in the Joomla modules manager, you can select a menu item you want to be used instead of the current one for the links of the products displayed by the module.
If the listing is not a module but your homepage menu item then that option is not available. But there are solutions:
- change the type of your menu item to something else and use a module to display that products listing on the homepage (so you're back at what I suggested above)
- use the extension Advanced Modules Manager Pro. It has some options to restrict the display of modules based on whether you're on a products listing or a product details page regardless of the menu item.
- You could enter the URL you want for each product in its "canonical URL". It needs to be a valid link of the menu item you normally use to access the product. Then, activate the "force canonical URLs on listings" setting in the HikaShop configuration and in that case, the canonical URL will be used instead of generating the URL for the product page if one is specified in the product.