To un-map a mapped product in Webgility we need to use the Product catalog.
Select Products --> All Products
Under All products section, you'll see the list of mapped products
Use the View Filter option to view the mapped products list.
(Note: We can also search the incorrectly mapped products by searching with the Product name).
Select the product you'd like to un-map by clicking the checkbox on the left side.
You can now Un-Map the product
(Note: Un-map option is available in the item status column).