The Board preferences control the basic appearance of the backgammon board in the Board window.
Choose whether your home is the lower left quadrant or lower right quadrant of the board.
Choose whether your checkers are red or blue. (These colors are not configurable.)
Choose whether the neutral cube displays a 1 or a 64. Yes, this is rather geeky...
Choose whether to indicate which pips are legal targets for a move. This only affects moving checkers by dragging. The legal targets will be indicated by a colored bar on the edge of the board, and as you drag the checker over a pip that is a legal target, the pip will be outlined in the same color (you can choose the color by clicking the color chooser in the preference window.)
When checked, the board will display inlaid pip numbers in the middle section of the board.
When checked, GridGammon will display the current pip count for each player immediately above and below the players' pictures.
See also: Gameplay Preferences