How can I change PDF orientation when printing on Mac Ventura?

In the macOS Print panel (and I am referring to Apple's Preview), you select the paper size, then the orientation to Landscape. This will automatically select Auto Rotate in the Preview section and your former Portrait PDF pages will be rotated 90° to the right in Landscape mode.

If you do not want that rotation, but to retain Portrait orientation in Landscape then deselect Auto Rotate and then decide if you will select scale and a percentage, or Scale to Fit and either Print Entire Image, or Fill Entire Paper.

Once you have these first two paragraphs figured out, then you visit the PDF > Save as PDF and the output PDF file will appear in Landscape mode according to your first two paragraph choices.

sound_patrol wrote:

When I change these parameters in Mac's Preview Print panel, it only changes them for the selected printer at the top of the Print panel. When I then visit PDF drop down menu > Save as PDF, it ignores the rotation and scaling selections I made and saves as a Portrait, A4 size, 100% scale PDF.

I didn't change anything for my default printer and my test worked as I described on Sonoma 14.6.1. These are not blanket changes for multiple printers nor is this a permanent setting. It will need to be done each time you visit the print panel and seek this form of output. There may be something about your current print driver that is interfering with your goal.

Select one or all of the pages in the pdf file and use the Tools ➙ Rotate Left/Rotate Right menu option to rotate to the desired direction. When you close the PDF file it will remain as rotated.

Change the orientation in Preview, as shown in my previous reply, before you start the print process. That will keep the new orientation as the default for that file.