Expand and collapse in matrix visual (Public Preview)
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End users who are familiar with the PivotTable experience in Excel need a similar one in the Power BI matrix visual. Users can expand items in the matrix to see details while still showing higher-level information.
You can create a multilevel hierarchy on matrix visuals by adding multiple fields to the ‘Rows’ area of the field well. You can then expand and collapse items in the matrix hierarchy by clicking the plus/minus buttons to show details at a lower level.