Hello @marketing10, it should work if you're using the correct latest versions of the kit.
Maybe it is something related to what Sam mentions in this post: Rich Text seems broken - #3 by samlittlefair
... you're using a line feed (
shift + enter) instead of a carriage return (enter) to create a line break. A line feed doesn't create a new paragraph; it creates a line break within the same paragraph, so the styles are applied to everything.