Tick the Colour box to show a colour for any tracks in this track group when they are shown on the playout log on the main interface. Click in the colour box to change the colour.
Tick the Icon box to show an icon for any tracks in this track group when they are shown on the playout log on the main interface. Click in the icon box to change the icon, the Select Icon window will be shown:
The priority is used to determine which track group is used when displaying a track on the playout log on the main interface that appears in multiple track groups. The track group with the highest priority will be used when displaying the colour or icon.