The
button or the View -> View 3D menu shows interpolated values
on all cells as a bottom plane and top curved surface.
The Image ->Rotate dialog rotates the view. Specify rotation values from
-180 to 180 in the boxes provided.

The Image->Format dialog can remove the bottom or top
surface, hide the dark sides, and change the color of a covering grid.

Elevation shows the distance from the surface to bottom
plane. Distance is relative to maximal side of bottom plane.
Height of Surface is the relative width of the top curve
surface.