Go to myactivity.google.com
Sign in to your Google account
Click Web & App Activity
Click Delete
Choose Delete today, Delete custom range, or Delete all time
Confirm the deletion
To delete individual searches, open My Activity
Find the search item you want to remove
Click the three dots next to it
Click Delete
To stop future web search history saving, turn off Web & App Activity
On mobile, open the Google app or browser and go to My Activity
Repeat the same delete steps on mobile