How do I use visual filtering on iOS?

Visual filter means that you interactively select a subset of a chart and it re-draws to show just that section.

Tap and hold to activate the chart menu.

Keep holding and slide to the Visual Filtering menu item to activate drag-select filtering mode.

Drag-select to drill down to lower levels of detail, based on what columns you select.

Note: To exit drag-select mode before selecting, click the X.

The chart is updated to show the selected subset of data.