For big drawings, Creo Elements/Direct Drafting displays parts that are smaller than a certain limit as magenta boxes (instead of entire parts) during the redraw process, by default. Creo Elements/Direct Drafting enables REDRAW_MODE PARTS_AS_BOX during the redraw process. As a result, many of magenta-colored elements are visible in the preview viewport (even though the magenta color may not be present in the drawing). To avoid this situation, Creo Elements/Direct Drafting disables REDRAW_MODE PARTS_AS_BOX by setting its value to zero when you open the Color Conversion dialog box. When you close the Color Conversion dialog box, the value of REDRAW_MODE PARTS_AS_BOX is restored.