You can visualize your metrics as a bar chart or linear plot by means of the Chart widget. It helps you to plot a number of metrics in the same coordinate system.
To study what data created every single chart, you can also switch to the data table itself (and back to chart) by pressing the icon at the top right corner of the widget screen (left one near the gear icon).
This widget provides a number of options for customization, which you can see at the left of the Add widget window. You can enter a new name for your chart in the rounded rectangle on the top of the left menu, and define a time range, which will work in the same way as the reports one but affect only this widget.
There are two options for time range: use the same time range as the rest of the report or define a custom one. The custom time range allows you to define dates manually or with a list of pre-defined options. Also, you can synchronize the time ranges of different widgets. And there is also the COMPARE THIS TIME RANGE WITH: option allowing you to create a comparison chart adding one or more time periods for comparison.
The next option allows you to define the amount of time, which will be grouped into one bar in bar chart or point in the graph. It works similar to a global one, which you can find in the report settings.
The next item - horizontal axis config - defines how to show horizontal axis data and label.
You can add a metric to a chart by selecting the checkbox near it (and hide it again with a second click). Each metric has its own settings, including color, title label (if needed), number of decimal places (default is zero), type of representation (a bar chart or a line graph) and the legend position.
Also from this menu, you can move back to the Define metrics window.