This screen is asking you how to map the status.
Your old workflow has a status "resolved" in it, and the new one does not. For any issue in status "resolved", JIRA needs to move it to a status that exists in the new workflow, and it's asking you which one.
The trick on this screen is look at the number of issues affected - there's a lot of "0"s in those blue boxes - that tells you how many issues are going to have their status changed, and you can ignore the lines with 0 on them!
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