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When you select a sprint, its list of issues is displayed. For each issue, the type, key, summary, status and assignee are displayed, similarly to the Jira backlog. The Estimation issue Estimate field displayed is based on your Jira board settings (Board settings → Estimation → Estimation Statistic). The available options supported are: Story Points or Original Time Estimate. Accordingly, the issue display shows the Estimate column in points or time units or points, respectively.
Importantly, as part of your planning refinement process, you can:
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