If you add a color scale to a map in Surfer, it is oriented vertically by default. If you wish to rotate the color scale so it is horizontal, follow these steps:

1. Select the color scale in the Contents window.
2. Click Layout | Arrange | Free Rotate | Rotate.
3. Enter -90 into the Rotate dialog and click OK.
4. If desired, on the General page in the Properties window, in the Labels section, change the Angle to 90.

Updated November 12, 2018