How do you insert paragraphs into the email editor and have them display correctly in the preview and the actual email?

Hello,

How do I insert a line break into an email, like a standard paragraph? Is there a way to insert multiples?

When I hit enter twice, it shows in the editor, however when I click on Preview, it doesn’t every break, only the first one. No matter what I do, I can’t actually format paragraphs in the email.

Editor:
Editor

Preview:
preview

If it matters, I’m using Edge to edit the emails since the Automation screen displays a white page whenever I use Firefox.