How to change the view of counter reading chart?

Hi PM Guru,

It is strange that the view of counter reading chart in IK18 list is different between production and test enviroment here.

We would like to have the "display variant" where we can select different views like "counter reading difference" to see the monthly consumption.

But here in production system, the display variant is not available.

Would you please kindly help me with how to make it visualized there?

Thank you so much,

Sally