I am trying to get all products using the wix-data.query(‘Stores/Products’) call that belong to a particular collection of products. The documentation says that there is a field called collections for a product, which when I query, this field does not even show up in products.
Not sure if i understood your question, but …
…might be the field you are searching for is hidden?
You will find visible fields in a collection and you will also find invisible fields in your collection.
Some of invisible fields are for example → ID / OWNER / UPDATED-DATE and so on. You have the oppertynity to show / hide these data-fields in your collections-property-panel.