If your chart (especially column or bar) is showing in monochrome (all teal) and you would like to distinguish the columns by colour, you can quickly enable data point coloring by individual colour under chart Settings.
Toggling the "Multicolor datapoints" setting under General Chart Settings will apply a default ImpactMapper colour palette to the chart.
Once applied your multiple column or bar chart should be displayed in colour like the example below:
To change the default chart colours, click on Colours in the settings menu.