SincerelyUnique opened a new issue, #19255:
URL: https://github.com/apache/echarts/issues/19255

   ### What problem does this feature solve?
   
   
   Hi Team sorry for bother you, I have a case, and I want to only display the 
first series line in the dataZoom bar (the shadow area that we dragged) , but 
now I found it always is the total of these two series, do you know how to 
specify the one fixed series in the dataZoom bar? please kindly help to check, 
thanks so much~~
   You can put below code and replace to 
https://echarts.apache.org/examples/en/editor.html?c=line-stack
   ```
   option = {
     title: {
       text: 'Stacked Line'
     },
     tooltip: {
       trigger: 'axis'
     },
     legend: {
       data: ['Email', 'Union Ads']
     },
     grid: {
       left: '3%',
       right: '4%',
       bottom: '10%',
       containLabel: true
     },
     toolbox: {
       feature: {
         saveAsImage: {}
       }
     },
     xAxis: {
       type: 'category',
       boundaryGap: false,
       data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
     },
     yAxis: {
       type: 'value'
     },
     dataZoom: [
       {
         type: 'slider',
         showDataShadow:true,
       },
       {
         type: 'inside'
       }
     ],
     series: [
       {
         name: 'Email',
         type: 'bar',
         stack: 'Total',
         data: [120, 132, 101, 134, 90, 230, 210]
       },
       {
         name: 'Union Ads',
         type: 'bar',
         stack: 'Total',
         data: [220, 182, 191, 134, 290, 230, 150]
       },
       
     ]
   };
   ```
   
   ### What does the proposed API look like?
   
   I want to specify one fixed series line in the dataZoom bar, not the total, 
and not changed when I click or switch the legend, can you kindly help me to 
check?


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