Up-vote the suggestion to solve this issue! As it is now, you can only create a new sprint from the backlogg and then move it one step at a time to where you want it.
Up-vote here:
https://jira.atlassian.com/browse/JRACLOUD-72636?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&showAll=true
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