Double click on ‘Trend’ or ‘Europe’ or a country name like ‘Italy’ or ‘Germany’ in the list on the right side of the graph. This will make only the selected line of data appear on the screen. You can then single click on another item in the legend to bring up another line of data. Add as many as you like in order to compare them.
You can also zoom in order to examine particular moments e.g. the first day of the outbreak in Europe. Zoom in using the + key in the tool bar, or by clicking + and then highlighting an area using the cursor. Autoscale in the tool bar will return the screen to normal.