Hi, in trying this
----
\documentclass{article}
\begin{document}
test $\alpha + \beta$. %% preview should appear here.
\end{document}
% Local Variables:
% TeX-engine: xetex
% End:
----
and on generating previews the color for the preview
is black which shows badly on a dark theme
With the default TeX engine, the color of the preview
obeys it seems the main face color
as shown in attached screenshots
Best,
Jean-François
