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
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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