Currently, it is not possible to configure collections. However, we do have an issue on our backlog for giving more control over that feature. The collections present in autosuggest are intended to help visitors more easily explore content available on a Hub. However, unlike the search results page, collections are not supposed to show in the autosuggest if you have no content of that type in your catalog. If you only had data in your catalog, then only data should show as recommended in autosuggest. I was able to confirm that is not what is happening right now. I will open a bug about it.