Add custom field to in-module search?

Add custom field to in-module search?

Hello! I added a field to my Contacts module, and would like to be able to see this field either in my default view, or search for contacts where that field is empty. It is a check-box that functions like the "Email Opt out" field.

I tried to add the new field to my search options in "Search Layout" customization, but still don't see it when I try to do an in-module search. I still only see the Phone, Contact Name etc., options...

I hope that makes sense...  Please help!  Thanks.