You can add, edit, and delete colors via the Color Tool’s drop-down menu. This allows you to customize your game’s colors.
If a new color can be added, it will be placed to the right of the currently selected color shifting the remaining colors to the right. Deleting colors will shift the remaining colors to the left in place of the color that was removed. Keep in mind that editing or deleting colors could have an impact on the way sprites are parsed when the game is loading up. It’s best to only modify system colors befoe you begin creating artwork for the game.
In addition to using the drop-down menu, you can also reorder colors by dragging and dropping them within the system color picker.