There doesn't appear to be any issue with the Free File version you're using.
Please try one or both of the procedures below.
With TurboTax open, you can either:
Click Pick up where I left off
Click Federal
Click Deductions & Credits
Answer any questions appropriately until you get to Did you make any estimated tax payments? and click the Yes, I did box
Continue to answer appropriately until you get to the Your tax breaks page
Scroll down to Estimated Tax Payments and click Start or Review
You'll see State estimated taxes for 2020.
Click Start or Edit to enter your information
OR
Click Pick up where I left off in TurboTax Online, type estimated tax payments into the search box, and click the Jump to estimated tax payments link.
When taxes aren't withheld from the income you receive, making quarterly estimated tax payments can help you avoid paying a big tax bill or an underpayment penalty in April.
