What is the intent for using a smaller output sheet size? Are you actually intending to print onto paper that size? If so, it can be hard to find paper in non-standard sizes.

It is easy to change a paper size and reformat the document to fit that size but it can get fiddly if your paper size doesn't match that going into the printer (especially if you are double-siding). Using the zoom to fit functionality of PDF is good but would be a lot better if the formatted aspect ratio (height/width) matched the output size.

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Andrew Lockton
Chrysalis Design, Melbourne Australia