Z-folds the long side of a copied sheet before feeding it out. This option is available when you print paper of 11 17 , 8-1/2 14 , A3 , B4 , or 8K . 8-1/2 14 is folded in two, not Z-folded.
To use this function, an option is required. For details on the required option, refer to Ici.