Because Book View sucks and many people choose to not use it all. They like to see the code AND the Preview at the same time. Code View/Book view limits you to one or the other.
If you don't want to use Preview, then close it. You'll not be bothered by it again until you choose to be. It's only an "extra" Window when you leave it open.
Also...
Quote:
Originally Posted by apoiata
Why we need Live Preview if we can split the screen in 2 parts: Book View and Code View.
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You
can't split the screen between Book View and Code View. As I mentioned above; it's an either/or proposition.