The PD_SHOW_COLOR and PD_SHOW_LABEL_SIZE options correspond to ICON Set Color and ICON Set Size on the screen menu.

PD_SHOW_USE_POSTFIX controls the display of dimensional constraints. When set to the default value of NO, the constraint value replaces the normal dimension text. If set to YES, the constraint value is displayed as a postfix to the main dimension text. Earlier versions of the software always displayed dimensional constraints as postfixes.