project coordinates

[Cheuk Ling]

Hi
I have assigned shared co-ordinate system to my project , so
now all co-ordinates readouts are shared.
How can I change them back to project co-ordinates reading ?
I ask that because I found that when I click properties to my
co-ordinates, the co-ordinates origin showing shared is greyed out,
no choice is allowed to turn it back to project.
So how to do ?