Adding product to SourceProductCategorySearchFilter widget

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Hi

We have a Product Information Forum on our Customer Portal site. There is a filter where you can search the forums by products. This uses a standard widget, SourceProductCategorySearchFilter. This dropdown filter is already populated with products.

We just released a new product and we would like to add the product tree that has been added to Products/Categories/Dispositions to this SourceProductCategorySearchFilter. However, I do not see an obvious way to do this.

The widget in the code has only one attribute applied to it.

<rn:widget path="searchsource/SourceProductCategorySearchFilter" verify_permissions="true"/>

So I suspect that there's some visibility setting in Oracle Service Cloud somewhere that would add this product to this menu, however I just don't see where that is.