It is pretty hard to file "accidentally." Did you go through all of the steps of the FILE section for 2019? Did you actually click on a big orange button that said "Transmit my return now?"
If you really did that, you cannot stop it or get it back. You would have to wait for the return to be accepted/rejected when the IRS starts accepting returns on January 27. But I'll bet you did not really file it.
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