Style definitions such as highlight, line thickness color can be changed after object selection.
Changing the Default Definition
Create a new layer called _NC_HIGHLIGHT with + button under Layer Manager.
In the Layer Properties window users can observe that the default layer (from _NC_HIGHLIGHT.NLR file) is loaded using the Load from Storage option with the right button.
After changing the color and line thicknesses, changes made using the Save to Storage operation with the right button of the same window are saved.