How to reset the "configuration" back to default? I accidently changed settings.

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.4
-- Error-message(debug-mod must be tuned on) -- : no products showing under "category page"

I was playing around with the settings in the "configuration". It was in the "display" section. The settings are now screwed up and are not showing the products correctly on the category page. I was under the impression that there would be some sort of way to restore it to default settings in case something went wrong. I could not find an option to restore to default. I tried uninstalling and re-installing Hikashop but the settings seem to stay. How do I solve this?