Issue with "Fixed Plane" being grayed out in GD&T Position.

[[El...]]

Hello,  I am working with two CMM's.  One of them has the "Fixed Plane" grayed out and one works perfectly fine.  I have no idea why, and I have been trying for days to get this fixed.  Does anyone have any ideas of why the Fixed plane is grayed out?

 

Thank you.

[[Br...]]

 

 

Hello Elijah,

Choose the light bulb on the bottom right corner, then select loose.