You can downgrade using the clear and start over feature....

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You’d only be charged when using Free Edition if you added add-ons or upgraded to a higher version. To see what you are being charged for please follow the instructions in this link https://ttlc.intuit.com/questions/2565973. Then proceed to follow the directions in this link https://ttlc.intuit.com/questions/1899480 to remove all unwanted add ons.

You can downgrade using the clear and start over feature. However, you will be required to restart your return. Please keep in mind that our various TurboTax programs handle different tax situations and their associated forms.

In TurboTax Online, you can erase your return and start from scratch as long as you haven't submitted payment, deducted the TurboTax fee from your refund, or registered.

If you haven't already done so, sign in at TurboTax.com and select the blue Take me to my return button.
On the welcome back screen, in the left-side menu, select Tax Tools, and then select Clear & Start Over (see attached Tax Tools)
Answer Yes in the pop-up to confirm.