I am trying to close a sprint and it says that I have most of the items not set to DONE. I have searched and searched and can't find where I set that status.
Welcome to the Atlassian Community!
I am sorry that the answer you got before was misleading - it was generated by an AI that has no understanding of your question or Atlassian software.
Jira's sprint boards work from a very simple premise - the last column on the board is "done". So go back to the board that your sprint is from, and make sure all the issues (and their sub-tasks, if they have any) are in the last, rightmost, column on the board.
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