You can do it using issue navigator with the Bulk change functionality. But you would need to write the correct JQL filter. You could copy your filter from the board and add " AND sprint is empty". Then you could bulk change assignee field for the selected issues. More about bulk change you can read here
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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