Magento 2 allows you to set visibility for each product:

You can select the following options:

1. Not visible individually
The product is invisible and can not be found via search or catalog. A product with this setting is not included in the feed to Tweakwise.

2. Catalog
The product is only findable in the catalog and not in search. A product with this setting is included in the feed to Tweakwise.

3. Search
The product is only findable using search and not in the catalog. A product with this setting is included in the feed to Tweakwise.

4. Catalog,search
The product is finable in both search and catalog. A product with this setting is included in the feed to Tweakwise.

A grouped product van hold multiple values. It might happen that 2 values are used. This means that there is a Configurable Product, where the Configurable Product has a value of 4, while the underlying Simple Product has a value of 1 (so they are not shown separately in the catalog and search).

The extension always sends the visibility with the feed as an invisible filter by default, so these Magento settings are copied in Navigator. This does result in the fact that the visibility filter will always be shown on top in the Statistics & Report > Filtering module under filter usage.