Today there is no way to limit the knowledge base widget to only specific collections. This makes it difficult to tailor the widget for different products to provide a more focused set of help content.
Without collection-level filtering, customers may see articles that are irrelevant to the product or workflow they are in. This makes it harder to find the right answer quickly.
In KB settings > Widgets, add an option to select which collection(s) of articles should be available in the widget.