ZW3D exports to PDF via the Opensource PDF code.
However Microsoft includes it’s own PDF Printer as part of Windows 10 and it is an excellent tool.
So instead of Export, use Print - and select the Microsoft PDF Printer
Then make sure the settings you need are adjusted as per the highlighted items below.
(The only down side is the setting reset when you change page format)
You will get an opportunity to choose the filename and location later in the process.