(repost of an answer to a similar question)
MANY MANY PEOPLE have been troubled by this longstanding, work-stopping MacOs LibreOffice bug ... including my spouse at 2:00 am.
Here is a clean workaround (which I found by exhaustive testing).
The chief advantage of this workaround is that it requires NO changes to the document itself---hence, no future changes will be required, if-and-when some future LibreOffice release fixes this bug.
• MacOS: works for both 10.11.6 (El Capitan) and 10.12.6 (Sierra)
• LibreOffice: works for both 5.3.6 and 5.4.2
Call up the print dialog for a "Letter" text document by the usual method, namely "File" -> "Print"
If necessary, select the menu item "LibreOffice" (other choices in this menu include "Layout", etc.)
Two tabs will be visible now: namely "LibreOffice Writer" and "More"; select the tab "More"
Now a menu will be visible, whose choices include "All Pages".
(Here's the "magic") select ANY menu item OTHER than "All Pages" ... then reselect "All Pages".
The net effect SHOULD be nil ... but instead, this sequence will trigger a refresh of the entire dialog box ... and the refreshed box will display a now-correct "Portrait" mode.
Problem solved ... but alas, this workaround must be applied anew for each new print job.
Hopefully this work-stopping LibreOffice bug---a bug of several years' standing---will be fixed sooner rather than later.
Whenever you have the slightest chance tu pull it through:
Use internationally standardised paper sizes. Deprecate the outdated US sizes. Even the UK switched to the international standards.
See: https://en.wikipedia.org/wiki/Paper_size,
I had this problem when I upgraded to 5.3.6.1 I went back to 5.3.2.2 and all is well on Sierra 10.12.6 link text
Issue persists in Mac OS 10.12.6 and Libreoffice 5.4.1.2 I reset the printing system and that seemed to fix the problem. Go to system preferences, printers & scanners then right click (control click) on one of the printers in the column on the left. Then select: Reset Printing System
Oh darn! I thought it worked, but I brought up a document in which I had already applied the Workaround described above. Set page format to 8.51 x 11.00. Now I've created a template for all documents, so I don't have to go switching the page format on every project. Guess we'll wait for the next version...
Same problem with my new 5.3.6.1 running on MacOS 10.11.6 Preview shows portrait, Print popup shows landscape and that's the way it prints. :-(
I changed paper size to 8.49x10.99 and now the Print popup shows portrait.
Version: 5.3.6.1 Build ID: 686f202eff87ef707079aeb7f485847613344eb7 CPU Threads: 4; OS Version: Mac OS X 10.9.5; UI Render: default; Layout Engine: new; Locale: en-US (en.UTF-8); Calc: group
As hes8 says, I also see portrait when doing File > Print Preview, but the mini-preview in File > Print is in Landscape, as is the printed copy. The mini-preview is in Landscape even when no printers are defined, as is the case after doing 'Reset printing system'.
8.49x10.99 works for me. Thanks!
Having the same problem with US Letter size on macOS Sierra version 10.12.6 and LibreOffice 5.4. This is super annoying! Please fix this problem!
For the time being, the user size 8.51 x 11.00 kluge/workaround worked for me too.