HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 91)

90 4 Advanced Printing Features EN
4 From the software or printer driver, select the desired type and
size of paper.
Note The type and size settings can also be configured from HP Web
JetAdmin for networked printers. See the printer software help.
Settings in the printer driver and software application override control
panel settings. (Software application settings override printer driver
settings.)