Just above the list of names there is a filter drop-down box that defaults to ALL, meaning it will show both confirmed and unconfirmed matches.  To show only the unconfirmed records, change the drop-down option from ALL to one of the options labeled Unconfirmed.  This will filter the records already confirmed from the list, and allow the user to continue matching.

ConnectRE Match Records screen

Additionally, clicking the I'm done matching for now button will also remove the previously confirmed records from the list, but this process will also link the Core record to the RE record, so you will want to make sure you review your confirmations before clicking this button.