The overrides colours tab allows changing various colours that can be applied to the bars.
Using override settings will ignore the skin settings, making this an option to permanently fix settings to your preference.
For the skin settings see the Skins Colours tab
Set the colours used for classes.
Set the colours used for roles.
Set the colours used for power. An example of use is lightening mana.
Set the colours used by the background bar and background border when configured to use Adaptive colours on the Bars Colours tab