Open the Google app on your iPhone
Tap your profile picture in the top right
Tap Search history
Tap Delete
Choose Delete today, Delete custom range, or Delete all time
Confirm the deletion
Open Safari or your browser
Go to myactivity.google.com
Sign in to your Google account
Tap Delete
Choose a time range
Confirm the deletion
Turn on auto-delete
Open myactivity.google.com
Tap Auto-delete
Choose an auto-delete time period
Confirm the setting
Clear Google app search suggestions
Open the Google app
Tap your profile picture
Tap Search history
Delete individual searches if needed
Clear browser history if you used Google in Safari
Open Settings on iPhone
Tap Safari
Tap Clear History and Website Data
Confirm the action