Reduce the spacing between metals while placing stack auto via.

Hi,

While placing Auto via  from M4(H) to M6(H) and there are some M5(V) routing on them it will add via where M5 is not there and will keep spacing between M5s those are routing and M5 in via.

It is keeping 0.55 where it can keep less space like even 0.1.

The tool is keeping more space than required. Where can I change the space so that I will get more vias.

Thanks,

Ganesh Doddipatla.