Settings for product feeds can be found under Settings >> Apps >> Product feeds

On this page in admin you will find settings for product feeds for Google Merchant Center and Facebook Catalog:

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Which field should be used for product descriptions?

Choose between description, introductory text or both introductory text + description

Should product type either be current product group (deep) or top product group (shallow)?

Select the depth of the product group you want to include in the flow. See example below:

A product belongs to product group 3. If you want product group 3 to be sent in the product flow, select the setting "Deep".

If you want product group 1 to be included in the flow, select "Shallow" instead.

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Google Merchant Center

Here you can read more about Product Feeds: Google shopping.

Facebook Catalog

Here you can read more about Product Flow: Facebook Catalog