Why is my printer printing only half a page?

Check the printer by debuging it: see if the paper is jammed, the toner needs changing, the power supply is functioning, or any other issues that would cause it not to print properly.

Check the software by ensuring the printer driver is up to date and the software is properly intalled for the printer.

Check the document making sure the page break is in the correct place, the page orientation is for printing, and the page size is set correctly.

Check your settings by ensuring the printer setting is set to print on both sides and the quality or color of the print job is correct.