What is confusing you? The 4/15/2021 estimated payment has nothing to do with your 2020 tax return. It is an estimated payment for NEXT year. Did you think it is for paying this year's tax due? You should have a Single 1040V voucher for the current year tax due or you entered your bank info for the IRS to pull it out of your account.
The 1040ES are estimates for next year. The 1040ES quarterly estimated tax payments DO NOT get sent to the IRS or state with your return. They are optional to pay. Turbo Tax is very conservative and doesn't want you to owe too much next year. They might have printed out if you got a one time large income this year. Like if you took a IRA or 401K distribution. You can ignore them. You might want to adjust your withholding at work so you won't owe too much next year.
