Hmm.. Not sure if this is OOTB feature since in Jira this is not implemented yet to add Future Sprint dates - https://jira.atlassian.com/browse/JSWSERVER-7740
So, the one way is that you are using Jira Labs feature called Parallel Sprints that allow starting more than one sprint at the same time.
Anyway in order to change that date procedure should be the same. Go to you board backlog and find your future sprint called "MARI 19.1.1" next to the name you should see dates. Just hover over and edit those.
If that is not the case then you probably use some Jira addon that allows adding dates to future sprints.
Is there a way to modify future sprint dates using Jira out of the box, without having to purchase an addon? I currently do not see or have an option next to the sprint name called "dates". Not having this capability is completely hosing up my Portfolio plan for my current Program Increment (PI) because the stories are not showing in the timeline with an accurate target end date.
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