I noticed this annoying bug when using Numbers.app in High Sierra: if my page setup says landscape, when I print the page it is chopped off and in portrait mode! (The king of annoyingHigh Sierra bugs is still the blurry rendering bug seen every goddamn time you turn a page in Preview.app.)
The solution to the cutoff-portrait printing bug is to reset the printing system, as follows. Before doing so, be aware that the price involved is rebuilding all printer presets. Take a note of them before starting.
- Go to System Preferences, select Printers and Scanners.
- Right click on the printer and select “Reset Printing System”. This will remove all saved printers and their preferences but will not delete the drivers.
- Add back all of the printers using the + button.
- Rebuild all of the printer presets.