The EXTRAS submenu lets you change the appearance of the display:
    <2=N;> Set: Y,X,C,S,G,G+,K,J,Mu,An,Ou,Ex? <G+>: EX
    \* Options are:
     1) Text:   Size, Color, Title, Labels, Move
     2) Curve:  Symbols, SIze, Fill, Lines, Color
     3) Grid:   Screen, Ticks, Grid, Color
     4) High Resolution <Off>
     5) Color           <Off>
     6) Overlay of separate pages for the grid, each symbol, and fits
    <3=X;> Set? <C>: