Go to https://myactivity.google.com/
Sign in with your Google account
On the left, click Delete activity by
Choose a date range or select All time
Click Delete
To delete a specific search item: open https://myactivity.google.com/ and find the activity to remove, then click Delete
To pause future search history: open https://myactivity.google.com/ and turn off Web & App Activity
To manage search personalization: go to https://adssettings.google.com/ and adjust ad personalization settings