If you specify a Coloring variable, the colors of the rectangles correspond to the levels of the variable.
If the variable is continuous, the colors are based on a continuous color theme setting. The default color theme is Blue to Gray to Red. The color of each value is based on the average value of all of the rows. Blue represents the lowest values, and red represents the highest values. The color is most intense at the extremes of the variable, and paler colors correspond to levels that are close to the mean. For example, see The Treemap Window.
Note: If you have used the Value Colors column property to color a column, that property determines the colors of the categories.
If you do not specify a Coloring variable, colors are chosen from a rotating color palette.
Related Information 

Help created on 9/19/2017