Sharing groups with other groups

Hi All:

We are in the process of rolling out v3.6.4 to our company and want to utilize A/D groups to populate contacts. We especially like the feature where we can share one group with another, but I have noticed that on the scroll bar menu not all of our groups are listed. It starts in alphabetical order with “A” and stops around D. This is around 2100 groups, but we have about 5000 more. How can I display all of those groups??

Thanks!!