Hello @Vaidehi Rayate
Welcome to the Atlassian community.
When you are viewing a board there will be a Reports option in the panel on the left. From there you can select the Sprint Burndown Chart report (in a Team Managed project) or the Sprint Report (in a Company Managed project). Each report allows you to select the sprint you want to view, and that will show you the issues completed in the selected sprint.
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