To opt out, or "Pause" as Google is tellingly calling it, from the article:

   To opt-out of Google’s identified tracking, visit the
   Activity controls[1] on Google’s My Account page, and
   uncheck the box next to “Include Chrome browsing history
   and activity from websites and apps that use Google
   services." You can also delete past activity from your
   account.

[1] https://myaccount.google.com/activitycontrols