I designed a 2 page design document in Fireworks CS4 with a canvas size of 1024x78. When I exported it to a PDF, the PDF page width is very high giving rise to horizontal scroll at 100%. My question what is the correct canvas size I should use?
If you don't view at 100% it won't scroll. The PDF is a printable file and larger on screen then most resolutions. Your design probably fits the page fine when printed. This just my "guess" :-)