@AlokKumar
Apache NiFi does not have a configuration option to allow Connection Queues to show more then the highest priority 100. Assuming a normally running dataflow, the listing of a queue would become outdated the moment you listed it as those highest priority would most likely been processed on by the time the listing was produced/returned to UI.
You could view provenance history for the processor feeding that connection to get more details on all the FlowFiles passed to that downstream connection. Provenance allows you to look at the current lineage of any FlowFile.
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Thank you,
Matt