By default, the main “over-time” graphic in Google Analytics reports displays an aggregate metric for all dimension values, but you can also use the Plot Rows feature to chart up to six specific dimension values.
Plot Rows is simple and easy to overlook, but it can be a quick and powerful way to break down aggregate trends into more specific insights.
Also keep in mind that you can select metrics other than the default to display in the chart. For instance, in the All Traffic report, we can display Ecommerce Revenue instead of the default Sessions metric.