Problem:
When a response has multiple sources, clicking on the citation number highlights the specific part of the answer that is supported by that source, which helps clarify exactly which information came from where. However, when there is only one source, clicking the citation does not show any highlight. This makes it difficult to know which portion of the response is directly supported by the cited source.
Why this would help:
Even when only one source is used, users still need to understand what part of the response is grounded in that source. A consistent visual highlight would make it easier to assess the reliability of the information and speed up verification and review.