DEFPLSTYLE system variable
Default entity plot style
Specifies the default plot style for new entities. In color-dependent mode drawings (PSTYLEMODE = 1), DEFPLSTYLE is set to "BYCOLOR" (Read-only). In named-plot-style mode drawings (PSTYLEMODE = 0), DEFPLSTYLE is set to "NORMAL" and can be changed. Use the CONVERTPSTYLES command to convert the current drawing to use named or color-dependent plot styles.