Before anything else, please note that we do not recommend modifying a published course. Any change could cause a problem in reporting.
What we advise you, in case of error or in case of need of modification, is to DUPLICATE your course.
If, despite everything, you want to modify your course without duplicating it, you can:
Change the details of the course (title, descriptions, categories, linearity, trainers, cover image, color of the banner, certificate and, if there is one, decided to show it or not in a sub-portal);
Change the configuration of the modules (note: the changes are not retroactive);
Change / create reminder emails.
You will also not be able to modify the order of the modules, nor to delete them.
Be careful not to click by mistake on a module and add one because undoing it is not possible!!
Also, the parameter to enable the forum or not CANNOT be changed.