Hi milltownham,
Please make sure you are using the right version
Spire.PDF Pack(Hot Fix) Version:3.9.285 bacause we made some change and adjustment in the recent versions.
Our Spire.Pdf is based on the "Portrait" orientation in the adobe print settings.
With the below details, you can have a better understanding of the four choices.
ActualSize: printing at the top left with the actual size of the page.
CustomSize: printing in the center with the custom scaling you want.
FitSize(by Default): automatically adjust the size of the content to adapt the page size
ShrinkOverSize: printing in the center with the actual size of the page.
By the way, at present we will not take the new feature into consideration bacause the "ShrinkOverSize" is for center and actual size printing.
If the issue still troubles you, please send your sample pdf file to us via email(
support@e-iceblue.com).
Sincerely,
Jane
E-iceblue support team