Since you are choosing to itemize your deductions, this should be blank.
For 2020, you are allowed to deduct up to $300 ($150 if Married filing Separately) of cash donations to 501(c)3 organizations even if you do not itemize your deductions.
In order to take this above-the-line deduction, enter your donation(s) under Deductions &Credits > Charitable Donations > Donations to Charities in 2020. TurboTax will enter the donation as a deduction on your tax return if you do not itemize your deductions.
On your form 1040, this deduction is on line 10b - Charitable contributions if you take the standard deduction.
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