I have selected "Microsoft print to PDF" as default printer.
When I in WeBuilder selects the "Print preview", it prompts me for a location/filename for saving the PDF file.
Nothing is saved and it doesn't matter if I provide a filename or click cancel.
Same happens when I use a "normal printer". Here I can see that "Print preview" contacts the printer.
IMO "Print preview" should NOT contact the printer, as nothing is sent to the printer at this stage.