How to determine storage capacity on pr4100

[Delirious]

I have a pr4100 with two disk set up in mirror raid as volume 1 and another two drives in mirror raid set up as volume 2. The home screen is telling me total capacity but I’d like to know how much drive space is left on each volume set. I get a total of all the two volumes in the home screen. Has to be a way to see what each pair is doing.