In order to customize the Y axis range, click on the “Customize” button on the report create or report edit page. Generally speaking the Y axis range is automatically defined based on the minimum and maximum values. However in case if you would like to manually specify the range then the steps mentioned below can be used.
Double click on the Y Axis Range icon. You will see the below modal window
Provide the range of Y axis as required.
Click Ok. The Y Axis Range icon is highlighted. Click on small tick to apply the customization.
The customization is applied.