Steps for Lookup a product.
Click on the Product from the sidebar.
Click on More (drop down) at the right top corner.
Select the Lookup option.
Select a product for lookup.
Click on the Fetch button.
Select the variant you want to look up and click on the Fetch button.
You will get the details of the product e.g. Store Name, Product Name, SKU, Variants, and the Quantity against each store.