How to find the Plane of the default Plane object?

I have a default Plane object in a scene, I would like to get the Plane that the object is positioned on.

Basically how to turn the Plane listed in here:

into one of these:

You can use Plane.Set3Points or Plane.SetNormalAndPosition, if you are willing to use code.
I’m not sure if it can be set through the inspector.