Max page width in LibreOffice

I’m trying to use LibreOffice writer to redesign a large noticeboard (4.7m wide).
The printers want a correct-sized PDF, and the obvious way to do that is by setting my page dimensions to the same of the noticeboard.
LibreOffice writer seems to have a maximum page width of 300cm. How can I increase this?

Thanks in advance!

Draw has a page size maximum of 3m. See here Is it possible to modify the maximum page size in draw to be greater than 3m?

Please see this answer