Click the gear icon on the Bing toolbar to open the Settings page. Clear the check mark next to "Turn Suggestions On," then click "Save." Bing no longer shows its own search suggestions. If you're signed in to your Microsoft account, Bing remembers this setting whenever you're signed in.

Your history for all the things you search for using Bing are stored on your Microsoft account, so head on over to your Microsoft account's privacy settings, and sign in. After signing in, you'll see your account's Privacy dashboard. Scroll down a bit to the "Search History" section, and then click "View And Clear Search History" button.

Log into your Microsoft account or go to Bing’s official website to log in. Click on the Menu tile and select Search history. Hit the Clear all button.

Go to https://account.microsoft.com/privacy/,please make sure to sign in with your Microsoft account. Scroll down to Search History which shows the things you type when you search for information on the internet using Bing. Just simply click on 'Clear seach history'.