Configure global CAD visualization settings
From the CAD Preferences, you can adjust the default settings for the following:
- Line thickness
- Point size
- Line color
- Point color
- Layer color
- Lock color
- Curve direction
Configure visualization of specific CAD objects
To change the color of individual polylines, arcs, circles, and points, move them under a group object 
in the Object List, then click on the color box of the group, and choose the desired color.
To change the color of CAD entities contained in a reference layer 
, click on the color box of the reference layer, and choose the desired color.