We update our ring groups quite frequently. With the latest release when you click on Ungroup it deselects the current users of the group and also includes users that were previously removed from the group in the list of members that can be selected. With the amount of ring groups that we have and the amount of members within each ring group it can be difficult to memorize who should be there and who shouldn't.

How do I go about removing previous members from the ring group screen altogether?