As we just demonstrated, sometimes plotting two measures on the same axis doesn't work because of their relative values, or because of their incompatible units of measurement. The following steps demonstrate how to specify a different axis for each of the measures in the bar and line chart.
To assign the GDP per Capita to the secondary axis, click the icon (down arrow) on the
GDP per Capita field.
Select Axis, and then select Secondary Axis.
Notice that the both the blue bars ad the orange line are now clearly visible.
The graph lists Life Expectancy on the left-hand vertical axis, in the range of 0 through approximately 70, and the GDP per Capita on the right-hand vertical axis, in the range of 0 to just under 14k.
Click Edit next to the title of the visualization.
World Population - Dual Bar and Line.
Above the left navigation bar, click Save.