Have noticed that in the beta version of C/E and ECS the predictor line is missing the ability to change color, also I believe that the users would appreciate the ability to change line size like they can with heading line stern line and tracks.
The color change feature is especially useful when changing to dusk and night mode for a high contrast.
The next update will change the predictor to use the standard IHO colors which will be black in day mode and shades of gray in dusk and night modes. This will make it more visible regardless of the chart colors being used. Hopefully that will be even better than making it user-selectable since finding a color that works well in all modes can be challenging.