You can opt-in to get an LLM response by phrasing your queries as a question.

Searching for “who is Roger rabbit” gives me Wikipedia, IMDb and film site as results.

Searching for “who is Roger rabbit?” gives me a “quick answer” LLM-generated response: “Roger Rabbit is a fictional animated anthropomorphic rabbit who first appeared in Gary K. Wolf's 1981 novel…” followed by a different set of results. It seems the results are influenced by the sources/references the LLM generated.