Frederic Fol Leymarie wrote:
> How to set LyX to use other fonts than the ones
> listed under Layout->Document->Layout ?

In the preamble. See
http://www-h.eng.cam.ac.uk/help/tpl/textprocessing/fonts.html
http://www.tug.org/tex-archive/macros/latex/required/psnfss/psnfss2e.pdf

> In particular : the *arial* fonts
>  (or is it done from the preamble ?)

I'm not sure that you'll find LaTeX font metrics for Arial.
If it doesn't have to be Arial really, try Helvetica (helvet in the font 
selection). It is really quite similar.

Jürgen

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