...

However, to turn on the category feature from Hawksearch, the steps below are required. 

Update Theme Files

The default theme’s category.html template will need to be customized to allow for results from Hawksearch to display properly and power the category pages from Big Commerce.

...

If you have your BigCommerce storefront theme running locally, simply open the following file in your text editor of choice if you’re running your storefront locally, or by the theme editor section in the control panel (instructions follow).

templates > pages > category.html

Replace the HTML between {{#partial "page"}} and {{/partial}} with the following code:   

...