In the Planner Colours
section of the tool part you can specify the colours that should be used
for various parts of the chart.
If you select the "..." button next to a colour a
Colour Picker will open.
To chose a colour simply click on it and select OK.
As you hover the cursor over different colours their names
and HEX codes are displayed.
To remove the colour and return to using the default colour
select the Clear button.