Hello,
Built-in search includes search by posts, pages, products (description, title, SKU) by default. There is no option to search by brand, tags etc. We did not test search plugins with our theme and especially search by built-in brand option, so, we can’t recommend anything, unfortunately. Actually, I suppose if you want to search bu built-in brand then you will need additionally customize either theme or plugin. You can contact Codeable or WPkraken teams to submit customization request and get the quote.
If you use third-party search plugin you will need to replace our search by the plugin search field. If you choose theme customization then you don’t need to replace search.
Regards