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Only assign guests who have accepted
To assign to seats only those guests who have accepted your invitation:
2.Select Accepted in the Allow seat assignment with RSVP drop-down menu.
4.If you have unaccepted guests assigned you will have the option to unassign them. Click Unassign.
5.If you have unassigned guests select File>Auto Assign Seats. Only guests who have accepted will be assigned to seats.