Assign Track Color… – Logic Pro keyboard command of the day

  Assign Track Color...

Set the track color to a color selected from the color palette.

Change track colors in a Logic Pro project – Apple Support

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 header components to show the track color bars.