Most chart types can be converted to drill downs by adding multiple fields to the "Labels" box as shown below. This indicates that the fields on the left will be partitioned by the fields to the right as a user clicks on individual chart segments.
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To utilise the drill down, click on a slice, such as ‘Renae Ibrahim’ in the example below. Doing so will display the next level of partitioned data - this example shows the number of Actions per Responsible Person first, then when you click on a specific Responsible Person segment, it shows the number of Actions per Status.
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To go back up the drilldown, follow the breadcrumb available at the top left corner of the chart.
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