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Does Sumatra support Letter format ? Not A4.
Thanks

PDF readers and image viewers are set by the file contents so there is no default A4/Letter as such, however, SumatraPDF ePub support is possibly set to an A5 Layout

Feedback units e.g. page size dimensions depend on system locale so SI units in Europe and some American countries but Imperial mainly in North America.

For printing the output size will depend as above on the Windows Setting so in Europe, most users printers are A4, but easy to set to Letter or any other size.