Logic Pro X User Guide Font Much Too Big

Hi guys, I just purchased Logic Pro X from the Mac App Store, and then downloaded the User Guide into iBooks. I opened it up on my up to date (10.11.3 El Capitan) late 2009 iMac (Quad Core i7 16MB RAM) and the font is massive - I mean you get 2 or 3 works per line, 10-12 words per page which is completely unusable! My other books in iBooks are all fine but these Logic Pro X manuals are useless. Has anyone else found this, Apple mentioned anything about this?

Thanks James