When viewing the Sprint Burndown gadget from the dashboard, the option is and should only be to refresh and minimize:
To edit it you have to go to Administration > System > System dashboard. There it will look like this and be editable.
Hope that solves your issue!
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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