When I specify -40and 40 for S/D Via coverage, the source vias get aligned to the top, but the drain vias are aligned in the center instead of the bottom edge of the diffusion. In the tutorial, the vias are aligned to the top and bottom edges. Is there a way to force the drain vias to align to the bottom edge?

Use

+40

with the `+`; the

+

and

-

symbols indicate the alignment while the number indicates the percentage width. The value is interpreted as a string, not a number, so

+40

and

40

are different.