how to turn off 2 step verication

Two-step verification for Apple ID

https://support.apple.com/HT204152

Refer to the section: "How do I turn off two-step verification?

Two-factor authentication is enabled by default on new Apple IDs and cannot be turned off.

If you have an old account and recently activated Two Factor Authentication note this section of an Apple support article:

"Two-factor authentication for Apple ID" - https://support.apple.com/HT204915

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"Can I turn off two-factor authentication after I’ve turned it on?

... 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 ..."

I have the same problem after last update

If you have the same problem then I already posted the solution.

How can i turn off 2 step authentication

Please, read the thread you’re posting to.!

Limnos has already posted the answer to your question in the very first reply to this thread.