There isn't a Box 3 entry for 1099-NEC. Boxes 2 and 3 of 2020 Form 1099-NEC are reserved for future use)
From the IRS 2020 Form 1099-NEC Nonemployee Compensation,:
You are asking from the Retirement section of the program. Do you have a 1099-NEC, and are entering it in the wrong place? Or do you have a 1099-R?