Current row color dimming % (Tools=>Options=>Advanced)
The current row is highlighted with the color configured via "Tools=>Options=General". However, when the selected row already has a color, the meaning of that color is lost if we just use the highlight row color. To get around this, when the current row color is anything but white, GSAK will "dim" that color to indicate it is the current row. You can alter the % that GSAK uses to dim the color here.
Because of the colors used by some users, this value can also be negative - which will effectively "brighten" the color.