helgasoft commented on issue #20274:
URL: https://github.com/apache/echarts/issues/20274#issuecomment-2299934253

   _visualMap_ would have been the solution here, but looks like it does not 
work with _sankey_. Like:
   ```
     visualMap: {
       categories: ['1', '2', '3'],
       dimension: 'category'  // does not work with nodes data
     },
   ```
   Another solution could be to use _toggleSelect_ on **edge category** - 
[Demo]().
   
   
![image](https://github.com/user-attachments/assets/0e248424-5a2b-4526-9991-8a6618471df6)
   


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