[Paraview] Dataset name in a MultiBlock dataset and display of unstructured grid

[#CHENG ZHIGAO#]

hey,
     
     As a beginner in paraview, please forgive my silly questions. :<) 
    
     I have a multiblock datasets which contains several unstructured grid. If there a way to set a different name for each block? And What should i do if i do not want to display some of the datasets while displaying the others? Or how can I hidden them all if i can not display parts of it?
 
      Thanks for your help in advance.

Regards,
zhigao
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