Power Chart bottom legend sizing

Quick question about the Power Chart. I have several pre-configured with specific pens for customer to open on demand. They are complaining about the fact that only the first 3 pens show up on the bottom portion of the chart with the summary information, and it is a "hassle" to have to drag and expand this display to include all pens (up to 8 of them).

Is there any configuration parameter that I am missing that will cause all of the pens to display by default, or is there any other work-a-round to this issue?

As always, any assistance greatly appreciated!!