At the bottom, you can preview the font you have selected. Font Information' shows the info for the selected font. To set the font, press Ok . If you press Apply , the font is set, but this dialog doesn't disappear, so that you can re-adjust the font selected. Press Cancel if you've changed your mind about selecting a different font.
Most users prefer to select fixed-width fonts.
Adobe courier is often available and is strongly suggested for usage. This adjusts the width that Tab characters will have. This is measured in compare with empty space characters. So, if you've set it to value 4, for example, in a fixed-width font, it will look like there were 4 space characters there. The default tab width is 4.