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Opening the Approval menu on your JIRA menu bar, it is possible to click on the Bulk Approve voice in APPROVAL BULK ACTION section.
When clicking on the Bulk Approve voice the following window is displaed:
This window allows you to bulk approve issues pending user approval. The Bulk Approval window includes the following items:
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Clicking on Find issues button the window runs issues search. A message inform on issues returned by applying the filter criteria.
Clicking on the displayed number of issues, the plug-in opens a new window listing on the JIRA search Navigator. The issues can be so massively approved.