Go to the Bing homepage and click on Search History at the top of the page or go to the following link: https://www.bing.com/profile/history/delete On the right side of the page, you will see the Clear all button, this will delete your entire search history On the next screen, you will be asked to verify if you want to continue or not

If what you want to do is clear your entire search history, you can just click the "Clear Activity" link at the top right of your search list. You'll be asked confirm your action. If you want to delete your entire search history, go ahead and click the "Clear" button.

If You want to Delete all you can do it by clicking in option (see image below). If you don't see this option then try the next option. Go to this URL https://www.bing.com/profile/history/delete You will see the following message: You've cleared all your search history.

Step 1: Goto https://www.bing.com/profile/history/delete Step 2: Click yes Step 3: Then check https://www.bing.com/profile/history and ensure your history has been deleted