I try to solve this problem several times and give up. Now, when I have met him again, I decided to ask for some help.
I have this code for my Legend:
lege
If you don't want to show the series names in the legend you can disable them by setting showInLegend:false.
showInLegend:false
example:
series: [{ showInLegend: false, name: "", data: [], }]
You get other options here.
legend options
other chart options