We want to be clear that this change to sign-in does not mean Chrome sync gets turned on. Users who want data like their browsing history, passwords, and bookmarks available on other devices must take additional action, such as turning on sync.

The new UI reminds users which Google Account is signed in. Importantly, this allows us to better help users who share a single device (for example, a family computer). Over the years, we’ve received feedback from users on shared devices that they were confused about Chrome’s sign-in state. We think these UI changes help prevent users from inadvertently performing searches or navigating to websites that could be saved to a different user’s synced account.

We’ve heard—and appreciate—your feedback. We’re going to make a few updates in the next release of Chrome (Version 70, released mid-October) to better communicate our changes and offer more control over the experience.