If you use the formatting bar to format text, it unlocks the View→Markdown menu which has two options - Markdown or Syntax. This allows you to toggle seeing the source or formatted markdown.

If you do not use the formatting bar to format text, markdown is not enabled. I manually typed in text in markdown format and the menu didn't un-grey.

You can go into the app settings and turn off formatting, which will hide the formatting toolbar.

I think you really have to work hard to be offended by this.