In the Coloring tab, you can define and set the colors for TUs:
When this checkbox is checked, every TU is colored according to the settings. If you need coloring for the complete document immediately, you can press the button Color the complete document now to apply the settings to the complete document. If a document is colored, and you need to get rid of the coloring, uncheck the Coloring for translation units and press the Color the complete document now button.
To activate coloring for a special TU type, check the relevant checkbox. By clicking the Choose color command button, you can change the color according to your needs.