There is no option to turn off two factor authentication apple.
Can I turn off two-factor authentication after I’ve turned it on?
If you already use two-factor authentication, then you can no longer turn it off. Apple has certain features in the latest versions of iOS and macOS that require this extra level of security, which is designed to protect your information. If you recently updated your account, you can unenroll for two weeks. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security.
