HP LaserJet Pro 400 color Printer M451 series - Manual (Page 117)

2. Select the product, and then click the
Properties or Preferences button.
3. Click the Finishing tab.
4. In the Orientation area, select the Portrait or
Landscape option.
To print the page image upside down, select
the Rotate by 180 degrees option.
ENWW Basic print tasks with Windows 99