You can search for metafields by product titles in the application. You can also search for products or variants in Shopify Admin area. Type in the search terms in Shopify admin and find your product. Once you find the products in Shopify, click on the link that says more actions at the top of the product page and choose Metafields (for Metafields Editor) or View Metafields(for Metafields Pro). See screenshot below. This will bring you to the application and show the metafields related to the products.
You can find the same Metafields links under More actions for orders, customers, collections, variants, pages, articles(Blog Post), and blogs.
You can also trigger bulk edits of Metafields for resources like Products, Orders and Customers from Shopify Admin.
In the product listing page, choose a few products and then click on More Actions and Find Edit Metafields link under Apps.
You will be taken to the Metafields Editor app to edit all metafields for selected products.
Metafields for orders and customers can also be found under More actions when multiple orders and customers are selected.