How to enable Logical Disk Free Space

Hi 
I have installed SCOM 2012R2 and configured monitoring for Windows 2012 R2 HyperV cluster. i think i configured most of the part but i could not able to see my logical disk free space.
I treid to enable In Monitors --> Windows Server 2012 Logical Disk --> "Logical Disk Free Space" but its grayed out. 
can anyone tell me how to monitor my Logical Disk Free space and Physical Disk Free Space.
Here i attached the screenshot of my SCOM - Montiors
Regards
Kris
Kris

Thanks Gautam,
even i go through one by Monitors, i don't see any option to enable monitor. looks like its grayed out.
Regards
Kris
Kris

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