For the question "Enter Excess Contributions: Your Excess Roth IRA Contribution for Prior Years" only enter an amount here if you had excess contributions in 2019 and prior years that you did not withdraw by December 31, 2020.
You stated that the excess contribution was on your 2020 contribution and did not mention excess contributions from prior years therefore you do not enter any amount on the "Enter Excess Contributions" screen.
On the penalty screen enter the amount of excess contribution withdrawn by the due date ($3,800).
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