When you have put the catalog visibility of a product on 'hidden' then changes are you also want to exclude that product from your product feed. You can easily exclude those products by creating a filter that looks like this: And that's all, your hidden products won't show in your product feed anymore. Feel free to reach out to our support-team whenever you need help with this filter.
Almost every day we receive requests for support from our users because their product feed contains none or less products than expected. Mostly this is caused by product feed configurations which result in fewer products. For you to be able to identify possible caused we have listed the most common causes: The "Include product variations" feature has been disabled; The "Only include default product variation" has been enabled; The default item_group_id field mapping has been removed; Created filters; WP-cron [...]