In my dummy file, I put Widowed under marital status for the taxpayer, a day of Nov 1, 2022, ticked "Were you married at any time...." as yes.  Also on the Info screen, under Spousal information, I put her date of death as Nov 1, 2022.  When I did this, the 1 automatically showed up on line 57730 on the T1EFILE screen.