Enabling “show trackball” and “common series range” in linear chart options

Hello all,

When configuring the linear chart in the manager, there are two options in the “more options” dialog box: “show trackball” and “common series range”. What are the effects of enabling them? This is shown below with screenshots.

Any help is appreciated.

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1- the Pie Chart

/customer/servlet/servlet.FileDownload?file=00P6000000em1SFEAY

2- Enabling “show trackball” and “common series range”

/customer/servlet/servlet.FileDownload?file=00P6000000eluAxEAI

3- Choosing points (communities) to identify in the app.

/customer/servlet/servlet.FileDownload?file=00P6000000eltsAEAQ

4- Opening the chart

/customer/servlet/servlet.FileDownload?file=00P6000000eltmvEAA

5- The chart, what is the effect of enabling them??

/customer/servlet/servlet.FileDownload?file=00P6000000em12jEAA