You can set the paper orientation to landscape by using Control Panel \ Hardware and sound \ Devices and printers, right-clicking on the Pdffactory Pro printer, and printing preferences.
After setting up AutoCAD, if AutoCAD is turned on at setup, it needs to be reopened, but the effect of printing is not what we want.
This is because "pdffactory Pro" requires that the defined paper orientation be consistent with the actual paper orientation, such as a width less than height should be specified as portrait, whereas a width greater than a height can be specified as landscape. With the following settings (the same setting opens AutoCAD, if AutoCAD is turned on at setup, you need to reopen), you can print a PDF with the paper orientation as horizontal.
pdffactory Pro Printing Preferences
Set the paper size to the previously defined "A3 T" under the map Sprite, and print as follows:
[Q] How to set the Pdffactory printer paper orientation to landscape