It is free to file an amendment tax return (1040X) unless you have to add forms that require an upgrade. But deleting a form from your return doesn't require an upgrade.
You might want to wait until your refund or payment is processed until filing the 1040X to avoid any delays. The IRS will only accept amended returns via mail.
The 1040X form for 2019 hasn't been approved yet by IRS. Please, keep checking the following information below on how to amend your return; it will be updated once the 2019 form is released. Currently, the form is scheduled to be released on 02/20/2020. FAQ How to amend a tax return
Please see What is the TurboTax phone number? for contact information.