I think that you may actually want PAPERSIZE.
Something like
Options papersize=(15in,24in);
BEFORE the ODS PDF statement would set the size to 15 inches wide and 24 inches tall.
Your should be able to reset to the default with
options papersize;
after done with the custom size.
Pagesize doesn't quite work because it specifies number lines and is OLD, like lineprinter old and intended more to work with SAS OUTPUT window destinations than ODS where the concept of a fixed line height does not apply as each "line" is determined by style settings for font size plus cell space around text and a few other things.
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