How to personalize the ressoucre content (editor_css_path)

I’m not sure I understand exactly what you are trying to do.

Maybe take a look at this topic:


This doesn’t seem to be a setting from the “TinyMCE Rich Text Editor” extra.

The exact configuration depends on the extra you installed as the richtext editor (and maybe the version of TinyMCE that extra uses). The MODX version is irrelevant.