How to Format Tree Map in Power BI with example?. It includes changing the Box Color, TreeMap Title position, background Colors, and Data labels, etc.
To demonstrate these formatting options, we are going to use the Treemap that we created earlier. Please refer Power BI Treemap article to understand the steps involved in creating Power BI Tree Map.
How to Format Tree Map in Power BI
Please click on the Format button to see the list of available formatting options for the tree map.

Format Legend of a Tree Map in Power BI
To display the Legend, Please select the Legend region and change the option from Off to On. From the below screenshot, you can see the legend

Format Power BI Tree Map Data Colors
By default, Power BI IntelliSense assign random colors to each rectangle box. But using this Data Colors section, you have an option to changes these colors as per your requirement.

For the demonstration purpose, we changed the rectangle Box of a Finance to Pink.

Enable Data Labels on Tree Map in Power BI
Data Labels used to display information about the rectangle box. In this case, it displays the Sales Amount of each rectangle box. To enable data labels, please toggle Data labels option to On.
From the screenshot below, you can see we changed the Color, Display Units from Auto to Thousands and Font family to Arial Black.

Format Category Labels of a Power BI Tree Map
Category Labels are noting but a Dimension value (Group Value) that represents a rectangle box. From the screenshot below, you can see that we changed the color of a category Label, Text Size to 14, and Font family to Georgia.

Format Title of a Tree Map in Power BI
Please select the Title, and toggle the option from Off to On to display the Treemap title. The following are the list of options that are available to format the Treemap title.

As you can see from the screenshot below, we change the Title Text to Sales Amount by Department Name. Next, Font style to Georgia, Font Size to 20, and Title Alignment to center.

Add Background Color to Tree Map in Power BI
You can add the Background color to Treemap by toggling Background option to On. For the demonstration purpose, we are adding Yellow as the background color. Here, you can change the Transparency percentage as well.

The screenshot below shows you the Treemap after formatting.
