For TurboTax online, "Tax tools" is at the bottom of left hand menu bar. For TurboTax desktop, "Tools" is found at the top left of page.
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Try switching to Forms Mode and change it on the form. You might have to find it on a worksheet like the info worksheet. If you override directly on the form you may not be able to efile.
Are you inside your return? You have to have your return open on the screen to get to Tax Tools.
Select Tax Home in the left menu.
Scroll down to Your tax returns & documents.
Select 2020, and then select Add a State (you're not actually adding a state, this just gets you back into your return).
After the return is open, click in the left menu column on TAX TOOLS
Seriously...I cannot thank you enough. I was like 10 seconds from loosing it and you saved my entire night. Thank you for breaking it down and explaining it this way to a very very very tired person. THANK YOU.