You don't need to change your camera at all to make sure you get the co-ordinates to show. I am probably not explaining things well. Here is a picture reference sort of:
This is just the default scene, and I've moved the camera down to around 100mm above the ground. As you can see on my screen most of the preview window is black and the co-ordinates are not showing correctly.

By pressing the "[" key once I then get this:

Pressing the "[" key again I get the full view visible and the co-ordinates are working fine.