In CM showroom, right-click the glass to select it.
In the edit pallette, click the 3 vertical dots that appear next to the name of the glass Material. You'll get a little properties window.
Click the "Change values" button at the bottom to open an editing window.
Lots of shaders stuff to edit there, and I'm no expert on what each property does exactly, but I've had success with this kind of issue by adjusting fresnelC, and fresnelMaxLevel. Of course, doing this on a car with windows which are just as you like, will give a set of values to try. Example:
Blend mode: Alpha blend
Alpha test: False
Depth mode: Normal
Shader properties:
• ksAmbient: 0.25
• ksDiffuse: 0.25
• ksSpecular: 2
• ksSpecularEXP: 650
• ksEmissive: 0
• ksAlphaRef: 0
• fresnelC: 0.1
• fresnelEXP: 3
• isAdditive: 0
• fresnelMaxLevel: 0.3
Hope this helps.
H/T to
@MrB00 for teaching me this.