You can delete the Form 4868 as it is not required to file a tax return. The IRS already knows that you filed for an extension.
Print the Form 4868 before deleting. See this TurboTax support FAQ for printing the Form 4868 - https://ttlc.intuit.com/questions/2879424-how-do-i-print-my-4868-extension-form-after-e-filing-it-th...
Click on Tax Tools on the left side of the screen. Click on Tools. Click on Delete a form
