The following steps help you meet the requirement.
Create a TreeMap sample and include the necessary script files.
Set enableDrillDown property as True in order to drilldown the TreeMap elements.
You can customize the drilled header color using the drillDownHeaderColor property.
You can refer to the following online documentation link for more details about DrillDown.
Sample Location for TreeMap-DrillDown:
Figure 1: Before DrillDown
Figure 2: After DrillDown
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