When you are in GE, and have your Route displayed, Right Click on the Route/Edit/Check in the Advanced box/ then under the Style/Lines tab, you can change the Color, Width, and Opacity of your route.
I did as you told. I can change the color and the opacity of the line. Now about the width, by default, it is 1.0 pixels. if I change to a bigger number say 3, 4 or teh line does no change in width on the map. Not sure what is going wrong
Someone also having this issue?