If you have changed your mind about using TurboTax, you can simply abandon the return.
If, instead, you're asking about changing from e-filing to filing by mail, see the instructions I'm linking below.
How do I switch from e-file to file by mail in TurboTax Online?
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***