Here you can define the following elements of the color settings:
Desktop color
Colors of signal lines carrying a logical "1" or "0" signal in simulation mode
Color setting for UDF block frame in circuit program
Colors for each of the four maximum possible block inputs and for the block output.
Background color of function blocks.
Background color of special flags.
Color of parameter box lines connecting parameter boxes from each other.
You can reset color on the chosen field by choosing different color panels from Swatches, HSV, HSL, RGB, CMYK and Standard.
The preview area shows your color selection.