I was always confused in Print Mode when I wanted to print to PDF that the page setup section showed a greyed out select field for the page size, and often with a page size displayed that isn’t the same as specified in the layout options. I just learned from a search here that printing to a graphic doesn’t require the selection of a page size as it will be taken from the settings in the layout options, but this isn’t obvious at all, and is rather confusing people when a different size is shown that you can’t change.
The thing is that I have specified A4 in layout options but somehow US Letter is specified in the page setup section in Print Mode (in both, printer and graphic targets). And if I change the page size in the printer target area it is also changed for the graphic target which made me always do this without understanding why this is necessary. And I still don’t understand why the (wrong) page size is shown in the graphic target, especially if it doesn’t matter anyway, since the page size is taken from the layout options?