You can delete the state tax return if you haven't already paid for it. Here is how you can delete you state return.
https://ttlc.intuit.com/replies/3301384
If you have already paid for the state return then you can call the customer service line and get a refund processed. Here is how you can contact a TurboTax agent.
https://ttlc.intuit.com/replies/5895579
