When analyzing a dataset, click on the following icon to access the scatter chart:
The scatter chart plots the categories from your 'By understanding' setting as scattered circles. By default the size and x-axis position of a circle is Frequency and the color and y-axis position is the metric you want to improve.
Click a circle to view that pattern in the Preview Panel on the right
Ctrl-click a circle to add it to your selection
Change the axis, color and size of the circles by clicking on them
Click and drag to select an area of the chart to zoom in