How can users drill down to filtered data in a tree map?

Drilling down to filtered data in a tree map is accomplished by clicking on bars or hierarchy values. This action allows users to interactively navigate through the different levels of data representation within the tree map. Each rectangle within the tree map represents a data category, and clicking on it highlights the associated data, enabling a more granular view of the underlying filtered data. This interactivity is a key feature of tree maps, as it engages users to explore and focus on specific segments of the data, making it easier to identify patterns and insights.

The other options do not effectively enable users to drill down into filtered data within a tree map. Selecting all rectangles at once does not provide any specific focus. Exporting the data to another application moves the analysis outside the visual context of the tree map, which hinders direct interaction. Deleting unselected categories disturbs the structure and may lead to the loss of relevant information, rather than facilitating a deeper dive into the data visualized. Thus, clicking on bars or hierarchy values is the appropriate method for drilling down effectively.