To issue a pre-account just press on top right. A non-fiscal document will be issued, with the total amount to be paid, which can be given to the customer. The advance payment is not binding, the sale can still be changed at any time.
Once printed, a confirmation message will appear at the bottom left:
If the printer is not reachable, the following message will appear:
NB In the absence of a default printer, a window would appear asking you to select one (Details in Document output printer selection.)