I agree with you @NLCPAS! We've heard from Spidell, Western CPE, and many other sources over the past year to file Superseded tax returns instead of Amended tax returns but we haven't been able to do that with Lacerte!
Because of 2020 tax changes that just passed in 2021, the superseded return is the easiest way to fix returns that are already done. (for example, the unemployment deduction on the first $10,200.00.) From what I understand, you can efile these. However, Lacerte will not let you file a superseded return, and I would like to know why.
"If you have already filed your 2020 Form 1040 or 1040-SR, there is no need to file an amended return (Form 1040-X) to figure the amount of unemployment compensation to exclude. The IRS will refigure your taxes using the excluded unemployment compensation amount and adjust your account accordingly. The IRS will send any refund amount directly to you."