How can I increase length of the Policy Violations widget in NCM Compliance dashboard?

If I understand correctly, I think I know what you are trying to do.

On the Policy Violations box, click Edit. That will allow you to pick and choose which policies to display in that box.

Correct.  Interestingly, I tried that a couple of times with the three reports I want to see and I only see two of them listed.  I added a few more and two of them show up.  It seems that reports will not show up unless there is an actual  violation.

Correct.  Interestingly, I tried that a couple of times with the three reports I want to see and I only see two of them listed.  I added a few more and two of them show up.  It seems that reports will not show up unless there is an actual  violation.

You can actually change that as well. Under your NCM settings, look for Manage Policy Reports. From there you can edit a policy report and check the box that says "Show rules without violation". That should get you what you're looking for.