Completing or Closing an Active Sprint
Open Jira portal
Go to Backlog
Go to the Active sprints of your Scrum board to view all the application 'active sprints' planning
Select the sprint you want to complete from the sprint drop-down or right pane, & click 'Complete Sprint' this will delete all finish tasks associated with sprint.
Note: that if you have multiple sprints in the Active sprints of your board, the 'Complete Sprint' button will not appear until you select one of the sprints.If all the work in this sprint is done the sprint is over.
On above right corner you will see Complete Sprint, click it.
If sprint has incomplete or open issues, a popup will emerge & ask you to select the next sprint to move All incomplete issues to new/upcoming sprint.
If the sprint has incomplete issues, select from one of the following:
Backlog, to move the issues to the backlog
Any future sprint, to move the issues to any future sprint that's already created
New sprint, to create a new sprint and then move the issues to the new sprint
Note: Your issues won't be marked with the date the sprint was closed; however, you can always view the sprint for an issue to find out when the sprint ended.