In Fountain Mode, each Fountain element can have Font Lock syntax highlighting toggled individually — or none at all. See (emacs)Font Lock.
In addition to faces for specific elements, Fountain Mode uses an Emacs
feature called face remapping, which means the
default face is
displayed using the
fountain face. This allows you to customize
fountain face just for Fountain Mode buffers. See (emacs)Face
This option is a list of Fountain elements to be highlighted.
Bound to C-c C-x * this command will toggle the display of text emphasis markup. See Text Emphasis.
Bound to C-c C-x !, this command, like above, will toggle the display of element markup. This means the leadings characters in section headings and forced elements.