By default, track colors reflect the track type. You can change the color of specific tracks, to use color to help visually organize the Tracks area and identify tracks in a large arrangement. Track colors are visible when you configure track headers to show the track color bars.
Changing the color of a track also changes the color of the corresponding channel strip in the Mixer.
Do one of the following:
Select the track, choose Track > Assign Track Color, then select a color from the Color palette.
Control-click the track header, choose Assign Track Color from the shortcut menu, then select a color from the Color palette.