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Answering my own question but apparently apple blocks the print from PDF option from Adobe and you can't use the system options.


I thought well then I need to print to a printer that just saves as PDF and found a free option online.
https://github.com/rodyager/RWTS-PDFwriter
This puts a new printer in your option and saves the poster pdf as a new document of letter pages.
Not sure why they haven't worked around this I saw a post from adobe 2018 that had the same issue on Mac but oh well.
Hope this helps someone else
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