On the other hand, I think the following is better:
Here is an image:
Is it possible to make the text before and after new paragraph? In preview, it is, but actually it is not. You can see this post, in my opinion it is not beautiful.
The setting @julian describes belongs to the browser (chrome/chromium in this case), not NodeBB.
If you're using chrome/chromium, press F12, then F1 to show the options. Check the option and keep the tools open while refreshing the page to ensure the cache is disabled.