[Paraview] Finding element number in the diagram

[Karen Lee]

Dear Paraview users and developers,

I'm interested in finding the element number (ID) that's closest to, or
containing a given point, or by clicking on the element itself in the
diagram (2D cut of a 3D mesh). This seems to be a simple question but I
haven't figured out. Can someone pls help?

thanks,
Karen
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