Hello @qaedtg111
You can try Ultimate Product Filter+Search since it’s the most lightweight and fully customizable. It doesn’t mess up your theme with unnecessary codes and has more advanced features like Merchandising rule for Search and Collection, Showing the matching variant image with filter selection or search term.
You could duplicate the live/original theme and set up the app into the copied one. This app fully supported almost Shopify themes and match with its layout.