Question about legend in Chart

Hi Community, have a question about legends in chart.

I create a slicer to select what measures shows in the line chart. It works fine except that legend always mantain the first measure in the values section.  (look the first Line Chart), Forecast is not selected and no value is in the chart but still in the legend.

In the second Line Chart a find a solution to this but is using a empty measure in first place in Values Section.

My question is if exist a direct way to sucess without using this "trick" 

Thanks.