HP LaserJet Pro M521 Multifunction Printer series - Manual (Page 111)

Set the paper size and type for copying on special
paper
1. From the Home screen, touch the Copy button.
2. Touch the Settings button, and then scroll to and touch the Paper button.
3. From the list of paper sizes, touch the name of the paper size that is in Tray 1.
NOTE: The product supports these sizes for copying: Letter, Legal, and A4.
4. From the list of paper types, touch the name of the paper type that is in Tray 1.
5. Touch the Start Copy button to start copying.
ENWW Set the paper size and type for copying on special paper 97