Hello, @DCD,
1. To know how to search products using product variation name, simply navigate to Dashboard >> XStore >> Theme Settings >> Header Builder >> Search >> Search Product Variations >> Turn ON and Save settings.
See the image for a better reference: https://ibb.co/HzkBBx7
2. Which subcategory are you talking about and which option do you have already unchecked? please share the screenshot of them and also the page URL as well on which this appears, I also need your site WP Admin URL and Credentials as well in the private content area of this topic, to check it on your site and help you out properly.
WP Admin URL:
WP Admin Username:
WP Admin Password:
Regards 8Themes Team.