Display preferences: View
Show current section only
Only the tracing associated with the currently selected section is displayed. You may have multiple sections in the same tracing file while only viewing the tracing of one section at a time.
Show suppressed as gray
Enabled when Show current section only is enabled. Displays the contours and markers associated with sections other than the currently selected one in gray.
Display thickness
Displays the thickness of the lines used to trace contours or trees. Control line thickness with File>Preferences>General Preferences>Cursor>Circular Cursor Size, the + and - keys on the numeric keyboard, or the mouse wheel.
The lines you see are representations of three-dimensional cylinders and frustaA frustum is a section of a cone, like a cylinder, but tapered.. When the 3-dimensional tracing is displayed on the flat screen, the result is a thick line if thickness is turned on.
Select one of four rendering methods: Tapered Thickness, Next Point’s Thickness, Thickness Ratio (Larger), Thickness Ratio (Smaller).
Color
Objects are drawn using the colors that you select.
Monochrome
Use in conjunction with the monochrome Lucivid. It is possible to switch back to color for editing and visualization when using the computer monitor.
Some of the features displayed in the tracing window may be displayed slightly differently to make up for the information conveyed by the colors. For example, the exclusion and inclusion lines of the counting frame will be represented by white solid and dashed lines, instead of red and green lines, respectively. 
Dim Monochrome
Use when the bright monochrome display overpowers your image. This is useful when using the Lucivid to trace very dim structures, such as weak fluorescent stains.
: Radius (in pixels) remains constant.
: Use Set Color to select a color for the reference point and the AutoMove box. See AutoMove
: Adjust the transparency to see the object you are tracing while tracing.