The firing order of items being ordered may be important. If configured thus, when the seat button above the posting list is clicked it will switch displays to firing items, and the selections will be ordered on the postings list differently, with items in the same firing category grouped together, rather than by seat ordering.
For example, drinks first, followed by salads, appetizers, entrees and desserts. If this is a desired display it needs to be configured before it can be used and if so can be configured with the menu items during set-up.
For more details: See Point of Sale (POS)Maintenance - Configuration Overview .