The Colors item in the View menu opens a Color palette that allows you to assign colors to channel strips. These color assignments are also reflected by Arrange window regions, and simplify the task of mixing—particularly the task of mixing groups.
Choose View > Colors, and click a color in the palette.
Close the palette by clicking the close button at the top left.
You can define custom colors by double-clicking any color in the palette. A Color wheel will open, allowing you to define the hue. Click OK to replace the selected color square of the palette.