Line chart for standard deviation in Kibana

Hi All,
I am developing an application which uses Kibana to analyze and visualize our data.
All other charts are going good but in the line chart which shows standard deviation, I get three separate lines, one for upper standard deviation, one for average and one for lower standard deviation.
Is there any way to show only the line for average standard deviation and skip the upper and lower standard deviation lines?
What I now have is this:

I just want the average line to show on my graph and not the upper and lower lines.
Any help would be highly appreciated.

Average standard deviation is just "average"

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do you know which formula Kibana uses to calculate upper and lower Standard Deviation?

Is this the right document to look at ?