You cannot export the entirety of a form's Products; instead, you will need to export products by Product Field.

To do this, click on the configure icon on the right-hand side of your 'Products' question. This will open your configuration settings, next simply click the products tab, from here you will see in the top-left corner the option to export and import.

From here, simply click export and your Product Field's products will be exported into a CSV file.