I have the same issue as the referenced article above. I want a category blog to show introtext and readme by default, but on certain menu items I would like only the fulltext to appear.
The suggested solution by FFrewin works: create a new category type called blogfull.
Unfortunately I need a similar solution as a module. My website home page has a half dozen modules sprinkled across user4-user7. The modules are of type article newsflash. Like category blog, I see no way to choose fulltext only.
So it looks like I need a new module type called say newsflashfull. But I've looked around and had no idea what moving parts need cloning/changing.
Help? Using joomla 3.7.5