Note:  There is no global way to unconfirm the links.
  1. In the filter dropdown, select Confirmed Matches
  2. For each record, click "Nope, these are different people" then "Revisit later"
  3. IMPORTANT: Do NOT click the I'm done matching for now button at any time during this process
  4. Once all records have been unconfirmed, click Connect Raiser's Edge from the Navigation bar to reload the plugin.  This will allow the records to go through the auto-match process again
  5. Then, go back into the Matching section and review and confirm as usual