Since you can't really control the scale in the List window...The trick is to set the desired scale for the output of the List window before setting a "View Set" for the List window. The scale should then be saved with the "View Set".
I just tested it on my WinXP install of AC8.1/PM3.1 and it seems to work fine.
David Larrew, AIA, GDLA, GSRC
Architectural Technology Specialist
a r c h i S O L U T I O N S
WIN7-10/ OSX 10.15.7
AC 5.1-25 USA