Thank you @VolvoGirl ! It was blank. And there was no refund, or tax due on the original.
My original 1040 was prepared using a free web-based, non-TurboTax, program. That program did not allow me to amend, so I switched to TurboTax desktop 2021 and, according to threads in this community, recreated the original in order to amend with TurboTax desktop.
In either case, line 30 was blank, and there was no refund, or tax due on the original.
