Edit latitude or longitude maximum/minimum.

I'm looking to change the maximum and minimums of the lat/long in my data template.  Since we drill holes in a limited area, I'm looking to tie things down to that area, particularly, to prevent a negative latitude or a positive longitude.  I'm struggling to edit them.  It's stuck.  This is what is shown.  The problem is that I can't do anything with the Min/Max values.  I can edit the display format choice and the decimal number, but not the other 2.  I've tried editing within a project itself and then also in the base gdt.  No go.  Suggestions?