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 have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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