By default, Surfer creates 3D surface maps with a 1.5 inch Z axis.  Any vertical exaggeration in the Z direction is due to this fixed default.  To adjust the Z scale (vertical exaggeration), follow the steps below.

1. Click the Map in the Contents window.
2. Click the Scale tab in the Properties window.
3. In the Z Scale section, adjust the Length (page units) or Map units per inch to the desired value. Setting the Z Scale to match the X Scale and Y Scale will result in a vertical exaggeration of 0.

Updated October 24, 2018