Zhang Weiwu wrote: > If I follow the "User's Guide", go to "Document" -> "Setting", and > change font to "helvet", and "Save", and view the output in postscript > (Ctrl+t), the document is the same (still use a san-serif font). Then I > go to "Document" -> "Setting" to check again, and discovered font > setting is still "default". It was as if the setting I made was ignored.
Which version of LyX? In 1.5.x, you have to change the "default family" to "sans serif". In earlier versions, you have to add the line \renewcommand{\familydefault}{\sfdefault} to the preamble. HTH, Jürgen