2-Step Verification makes your account more secure. If you turn off 2-Step Verification, you remove an additional layer of security, which can make it easier for someone else to access your account.
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Open your device's Settings app and tap Google
Your name
Manage your Google Account.
- At the top, tap Security.
- Under "How you sign in to Google," tap 2-Step Verification. You might need to sign in.
- Tap Turn off.
- Confirm by tapping Turn off.
Your name 
Manage your Google Account.Destroy all the backup codes that you've saved for signing to this account.
Revoke app passwords you no longer use
If you use app passwords to let apps access your Google Account, you may get errors when you turn off 2-Step Verification. If this happens, re-enter your Google Account password.
We recommend you revoke your app passwords:
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Open your device's Settings app and tap Google
- At the top, tap Security.
- Under "How you sign in to Google," tap App passwords. You might need to sign in.
- Next to an app or device, tap Remove
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.The next time you sign in to the app or device, you'll be asked to enter your Google Account username and password. If an app doesn't ask right away, it might take longer to recognize that its app password has been revoked.