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Currently, it's not possible to reorder sub-tasks on when using the new issue view. We have a feature request suggesting the implementation of this ability:
Please, click on vote and watch in order to hear about updates on the development cycle.
@Michael Magnussen we've just introduced ranking in the issue view! There are a couple of places for us to add real time updates being reflected across the views but the majority is in place now. Let me know if you have any further questions :)
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