Yes, we auto expand search when there are zero matches in the full page search, as said above.
What may be confusing everyone is that we started doing that for the header quick search, when there are less than 3 results for a search, but there we do not have any indicator that the extra results come from semantic search, as we’ve found it too small to add any indicators for that.
Our compromise was adding the ai-search-result to each result, so sites can optionally theme those differently or add any indicators they found necessary via our theming capabilities.
Our reasoning is that expand search automatically covers a lot of situations, like searching in another language (our semantic search is multilingual), typos, synonyms, etc