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Pareto Chart node (selected from QC Chars drop down menu in the All Validated Procedures) is an SVB node.
Similarly to all other graphing nodes it should include variable selection button (and be a standard, a non-legacy SVB).
To select variables one need to add an intermediate Select variables node. It is a workaround, but is very confusing for users who use other nodes where variables are specified directly in the node parameters dialog.