Hi,
I see no problem in doing that.
And it should be quite easy.
I'll suppose that you've just installed HikaShop.
There are only two steps in doing that:
1. If you unselected the "products listing menu item" choice during the install wizard, you need to go in the Joomla menu manager, and move the "products listing" menu item in the HikaShop default menus to your main menu so that you can have a link to a listing of all the products of your shop from your main menu. If you had left selected the "products listing menu item" during the install wizard, you already have such menu item configured.
2. You need to go in the menu Display>Filters, click on the "new" button there, set the "apply on" option to "categories" and save.
That will display automatically a filter dropdown at the top of the products listings on your website with the list of categories in it so that you can filter the products below based on the category selected in the dropdown.
As you can see, it should be easy to do. Now there are at least 2 reasons this might require extra steps:
- if you've turned off the "show filters" setting of your menu item, you'll have to activate it back
- if you've deleted the products listing menu item, or that you don't have it because you're using a template starter pack with HikaShop preinstalled without the "products listing" menu item, you'll have to recreate such menu item and configure its settings to display all the products in it via the Joomla menu manager.