Turn search history off or on - help.bing.microsoft.com
https://help.bing.microsoft.com/apex/index/18/en-US/10014
To clear all of your search history, on the Search History page, under Change history settings, click Clear all. This deletes any search history on this device. If you’re signed in to a Microsoft account. On your Microsoft Privacy dashboard, under Clear search history, click Clear search history, and then click Clear. This deletes any search history associated with your Microsoft …
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