Good afternoon, please tell me how to remove two-factor verification on iCloud?

There is no option to remove it after it has been on for 2 weeks or more. Before that, see instructions in the email from when it was turned on. Also see the following from Two-factor authentication for Apple ID - Apple Support

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.