Cancelling two-factor Authentication
I accidentally enabled "Two-Factor Authentication" feature in my Apple ID. Now I cannot disable. Please help me how to do?
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If it has been less than two weeks, use your enrollment confirmation email to unenroll. See the information below from Two-factor authentication for Apple ID - Apple Support
If you already use two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you recently updated your account, you can unenroll within two weeks of enrollment. 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.