This article describes how to set a PDF in legal size, landscape or portrait orientation.
Create a legal size PDF in QuickBooks Desktop
Save a PDF document in landscape or portrait orientation
The orientation must be set before the document is saved. Select the desired orientation in the printer options for the printer you are using in the QuickBooks Printer Setup for Reports.
Note: There is an orientation setting in the QuickBooks Printer setup window but it does NOT change the orientation when saving the PDF document. Orientation must be set on the actual printer properties.