I see that for the title you are using the h2 tag, therefore for the other text you need to use tags as well. Here is the result after adding to the text the p tag.
So why doesn’t it work like everywhere else where I click the headers and paragraph from the drop-down menu? why do I have to add the tags here and nowhere else
Most likely you have just copied and pasted the text and in such cases, the text area doesn’t set paragraphs. If you write manually it works as it should, I mean the text area sets paragraphs by default.
In the meantime, feel free to ask me any questions you may have.