My 2 cents:

  1. Viewer only mode is essential for me too.
  2. A three-state switch of the size (at least) of the editor two state switch, arranged left to right:
    [Markdown | Split View | Viewer Mode]
    would, IMHO, improve the UI experience.
    The three-state switch can be placed in the top bar right after the title bar ( assuming I have not modified the UI too much with CSS, forgetting its default state )
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