How to Customize the Colors Used in the Gantt Chart?

FROM THE MENUS:

From the ribbon menu « Style », pick one of the 6 pre-set colors:

Default: Green, Grey and Red
Blue
Purple
Orange
Pink
One color per person in charge: each team member can have his own color in the Gantt Chart

This option is also available on the left menu:

ADVANCED METHOD:

If you would like to further customize these colors, follow the below steps.

In the area « Name Box » (top left area of Excel), input exactly the following name: « CF_Gantt_Engine_1 » then push Enter.

The value « CF_Gantt_Engine_1 » corresponds to the default colors (Green, Grey and Red). If you would like to modify other pre-set colors, you need to select one of the below option:

CF_Gantt_Engine_2 : blue colors
CF_Gantt_Engine_3 : purple colors
CF_Gantt_Engine_4 : orange colors
CF_Gantt_Engine_5 : pink colors
CF_Gantt_Engine_6 : « One color per person in charge »

Then from the Excel Ribbon menu, click on « Conditional Formatting » then « Manage Rules »:

Scroll down until you see a color you would like to modify. Then click on « Edit the rule ». As of then you can change anything you wish related to this rule.