Numerator disappeared, how to get it back?

Please I spent 2 days setting up all configurations and menu all the sudden the numerator that show up when you enter the POS SCREEN to order items is gone, I'm not able to change price, or put item quanitity or search for ticket because the numerator just gone, how could I get it back? I'm using sambapos 2.99a as my pos system had an old pos software which is very hard to operate, the system requirement only allow for sambapos 2.99 tobe installed your help would be really appreciated.