If you want a fresh installation of JIRA without reinstalling, you can...
But, if you want just to delete the issue data but keep the configurations (workflows, users etc), just delete the projects, as Jobin advised.
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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