Export PDF

The export facility is very useful but does have some drawbacks.  It seems to recognise the page size used by Print Configuration but always seems to get the orientation wrong.  Or have I got a setting wrong?

It's also great to be able to export a whole set of drawings at once as a multi-page PDF.  The only trouble is that the file size can become enormous.  I am pretty sure the file ends up much larger than it would using the Print command and printing to PDF (which is native to Mac users).  Again, could I have a setting wrong?