How to turn off two factor authentication

As already posted, in all likelihood that’s NOT going to happen.

It’s simply how Apple - along with the other major “players” in the tech sector - are protecting their network and their users.

So … What problems are you having using 2FA with which we might help?

You might also carefully read and absorb the info contained in these two articles:

Two-factor authentication for Apple ID - Apple Support

Get a verification code and sign in with two-factor authentication - Apple Support

Once you have started two factor, you cannot stop.

As the above article explains (near the middle), this cannot be done.