Click on the y-axis and go to the Presentation properties tab. In the Axis category, set Synchronize to Values.
To display two y-axes with different values, please see: How do you add an alternate axis to a chart
Click on the y-axis and go to the Presentation properties tab. In the Axis category, set Synchronize to Values.
To display two y-axes with different values, please see: How do you add an alternate axis to a chart