Have been meaning to suggest this for awhile. It would be very helpful visually to have two different background row colors in user and group lists.
I do this in Excel/Calc all the time to help make a distinction between rows in a long list.
Sometimes when removing users from a group, it’s a little difficult to make sure you’re checking the “remove” box on the correct user.
Just something simple like a light grey for every other row in the lists.