how to configure libre office vanilla app to print in portrait

I am using Libre Office Vanilla app and trying to print a document. Cannot make it print in portrait view. The Libre Office site has indicated that the problem is with my printer settings. Have followed all instructions from Libre Office and from my Brother printer and all settings check out. Still, my print jobs continue to come out in Landscape, in spite of the print preview showing as Portrait.
I am using a Mac Book Pro / OS X / Yosemite 10.10.5. Can you help me?