Turn off two factor authentication

See this note:

"If you're already using two-factor authentication with your Apple ID, you can't turn it off. If you updated to two-factor authentication inadvertently, you can turn it off within two weeks of enrollment. If you do, your account is less secure and you can't use features that require a higher level of security."

extracted from this support article:--> Two-factor authentication for Apple ID

Regards

Giulio