HP LaserJet Enterprise MFP M725 series - Manual (Page 51)

4. Slide the paper-width guides wider than the
paper.
5. Load the paper into the tray. Make sure that
the paper fits under the tabs and below the
maximum-height indicators.
6. Adjust the paper-width guides so that they
lightly touch the paper stack but do not bend
the paper.
ENWW Tray 1 37