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PDF print size

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Hi. When I try to print a PDF in "actual size" it prints about 22% smaller then actual size, I have opened this PDF with MS Edge and printed it Actual Size and it prints Actual size. how do I change the Print scaling in Firefox so I don't need to open the "Dark Matter app" to print my patterns in actual size? Thanks, Fish

Hi. When I try to print a PDF in "actual size" it prints about 22% smaller then actual size, I have opened this PDF with MS Edge and printed it Actual Size and it prints Actual size. how do I change the Print scaling in Firefox so I don't need to open the "Dark Matter app" to print my patterns in actual size? Thanks, Fish