We’re pleased to announce that search engines will have access to a much larger pool of autocompletions. These additional autocompletions will not be customized to each search engine, and will be shown below any available engine-specific autocompletions.
Engine owners who prefer to limit their autocompletions to only those customized to their particular search engine can configure this by switching off the “Include autocompletions from the entire web” settings in Control Panel > Search features > Autocomplete.
Engines that have custom autocompletion excludes or exclude patterns will have this option off by default.