Specifies whether to display margins around the Terminal window.
If the Display margins check box is selected (default), text will not touch the sides of the Terminal window—instead a margin, or border, is displayed. Displaying margins may improve readability.
If you want text to fill the entire screen, clear this check box. If this check box is clear, text can touch the sides of the Terminal window, which may be useful for smaller monitors and notebook computers.
Depending on the screen resolution and the size of your Terminal window, you may not see an effect in the Terminal window when you clear this check box. This is because each character takes up the same number of pixels and if your Terminal window is sized so that its width is not evenly divisible by the number of columns, the Design Tool centers the text on the screen.