What Google changed
Before this update, a Google AI Overview on many queries loaded as a short summary with a "Show more" control underneath. Clicking it revealed the fuller answer, more source links, and the "Ask anything" follow-up box. That click was optional, and a person could ignore the Overview and scroll straight to organic results.
Now, for a subset of queries, Google loads the expanded version by default. The "Ask anything" input appears already open, ready for a follow-up question, and the organic results sit further down the page than they did under the collapsed version. Google builds in one safeguard: if a person has already started scrolling past the Overview when the expansion would fire, the system cancels it rather than shifting the page under them mid-scroll.
The behavior was first spotted by SEO researcher Chris Long on August 27, 2026, and confirmed the next day by Barry Schwartz at Search Engine Roundtable, with Google's Robby Stein adding context the same day (Search Engine Roundtable). Google's own explanation is that the fuller experience keeps people engaged longer: "our research has shown that with this dynamic experience, users find Search more helpful and engage deeper in follow-up exploration" (Search Engine Land). Read plainly, that is Google optimizing for time spent inside the answer box, not for clicks out to the web.
The presence-rate debate matters less than which queries are yours
Coverage of this change has leaned on a striking number: Advanced Web Ranking's tracker, sampling 8,000 keywords, found AI Overviews appearing in 75.24% of personalized U.S. results and 64.99% of non-personalized results as of August 31, 2026, four months ahead of its own prior forecast (xponent21). Similarweb's separate panel, drawn from browsing behavior rather than a fixed keyword list, puts the figure differently: AI Overviews appear on more than 40% of U.S. searches (Similarweb).
Both are credible sources tracking a real trend, and both can be right at once. The difference comes down to method: AWR's number reflects a personalized, signed-in sampling method on a fixed keyword panel, which tends to trigger AI features more often than a logged-out or blended sample. Similarweb's estimate blends real user sessions across a broader query mix, including navigational and local searches that rarely surface an Overview at all.
The lesson for a brand is not to pick a side. It is that neither number tells you what happens on your own priority queries. A B2B software company selling to procurement teams and a DTC skincare brand answering "best retinol for sensitive skin" live on opposite ends of that 40-to-75 point range, and only a query-level check tells you which end you are on. We covered a related split in how AI Overviews decide which domains to cite, where citation source mix also varies far more by category than any headline average suggests.
Why the expansion raises the stakes on citation, not only presence
Seer Interactive's February 2026 update tracked CTR on Google results carrying an AI Overview across 53 brands and 5.47 million queries. Overall CTR on those queries climbed from 1.31% in December 2025 to 2.36% in February 2026, an 85% increase Seer itself is careful to call a leveling off rather than a recovery, warning against forecasting from two months of data (Seer Interactive). The more telling figure sits inside that trend: brands cited within the Overview earned 120% more organic clicks per impression than brands the Overview left out.
That gap existed before the auto-expand test. It is likely to widen now. When the Overview loads collapsed, a motivated searcher can still reach the first organic result with one scroll. When it loads expanded by default, with a follow-up prompt box added on top, that same searcher has to travel further past AI-generated content before hitting a link Google does not control. Citation inside the box stops being one visibility channel among several and starts acting as the primary one for any query where the expansion fires.
| Behavior | Standard AI Overview | Auto-expanded AI Overview |
|---|---|---|
| Initial state on page load | Short summary, "Show more" visible | Full answer loaded automatically |
| User action needed to see full answer | One click | None |
| "Ask anything" follow-up box | Appears after "Show more" click | Pre-opened on load |
| Distance to first organic link | Shorter | Longer |
| Cancel condition | Not applicable | Cancels if user has already scrolled past |
| Who controls what fills the space | Google, plus whichever pages it cites | Google, plus whichever pages it cites |
What decides which queries get the expanded treatment
Google has not published exact criteria beyond "topics where our systems determine it's most useful." Based on how the company has described AI Mode and related conversational formats elsewhere, the expansion looks more likely on queries that invite exploration, comparisons, multi-part questions, and research-style intent, and less likely on short navigational or transactional searches where a person already knows what they want. That is an informed reading of the pattern, not a confirmed rule, and Google could widen or narrow the trigger set at any time without announcing it. Treat any category-level assumption about which queries qualify as a hypothesis to test against your own tracked terms, not a fact to plan around.
What to do about it now
- Audit your priority queries directly. Aggregate presence stats will not tell you whether your category's searches trigger a standard or expanded Overview. Check a representative sample monthly, since Google is rolling this out selectively and the trigger set will shift.
- Track citation position inside the box, not only presence. Being mentioned matters less than being the source the Overview draws its core claim from. Compare your citation frequency against the source mix data in our breakdown of the most cited domains in AI Overviews.
- Treat the "Ask anything" prompt as a keyword surface. Test what follow-up questions the box suggests for your head terms, and build content that answers those directly. That box is now visible to every searcher by default, rather than only the ones who clicked to expand.
- Widen your success metrics for high-Overview categories. Organic CTR alone understates value when Google pushes it lower structurally. Pair click data with branded search lift, direct traffic, and citation frequency, tracked with AI visibility monitoring tools built for this rather than a standard rank tracker.
- Revisit the queries where you already lost the click. Google's zero-click share sits well above half of all searches, and expansion adds pressure in the same direction. If a query already returns near-zero organic clicks, citation inside the Overview is the only visibility left to fight for.
If you want a clearer picture of where your brand stands on the queries that matter most, Elaventra's free AI Visibility Report shows which of your priority searches already trigger an AI Overview, whether your brand is cited, and where competitors are filling the space instead.
Frequently asked questions
What triggers Google's AI Overviews to auto-expand?
Google has said only that expansion happens "for topics where our systems determine it's most useful for people," without publishing specific criteria. Early observation suggests broader, exploratory, or comparison-style queries are more likely candidates than short transactional searches, but Google has not confirmed a formal rule and the trigger set can change without notice.
Does the auto-expand change affect every search query?
No. Google has described this as a dynamic behavior applied to a subset of queries, not a change to how every AI Overview loads. Coverage estimates for AI Overviews in general already range from roughly 40% to 75% of U.S. searches depending on the tracker and sampling method, and the expanded variant is a smaller slice within that.
How can a brand tell if its queries are getting the expanded AI Overview?
There is no Search Console report that flags expansion specifically. The practical method is manual: run your priority queries in a logged-in browser session periodically and note whether the Overview loads collapsed or expanded, alongside whether your brand appears in the citations. AI visibility monitoring platforms are starting to track this distinction as the behavior becomes more common.
Will AI Overviews auto-expand replace Google's AI Mode?
They are related but distinct. AI Mode is a separate, fully conversational search experience users opt into, while the auto-expand behavior changes how the AI Overview embedded in standard search results loads. Search Engine Roundtable's coverage described the expanded Overview as behaving more like an AI Mode response inside regular search, which suggests Google is narrowing the gap between the two experiences rather than replacing one with the other.
Google will keep testing how much of the results page an AI-generated answer can claim before a person ever asks it to. The specific trigger for auto-expand may change by the time you read this, but the direction will not: less space is being negotiated per click, and more of it is being decided by whether your brand is part of the answer Google chooses to show.