If your 2020 adjusted gross income (AGI) is too high, you don’t qualify for EIC, whether you use your 2019 or 2020 earned income. That’s why the program isn’t giving you the option.
IRS Pub. 596 - Earned Income Credit (EIC) states that: "You can elect to use your 2019 earned income to figure your 2020 earned income credit (EIC) if your 2019 earned income is more than your 2020 earned income."
You can review Worksheet A on p.45 of the Instructions for Form 1040/104SR to see how the computation works.
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