I am a litte surprised about the question, why I would need spell checking in book view.
As an author, the only reason for me to use an Epub editor like Sigil is to write a book directly within the Epub editor without the need of a word processor like Word. For the writing process, I naturally use book view, not code view. Code view is required only for formatting purposes.
I do not know whom Sigil sees as their target user group. If it is book authors, all functionality like spell checking and find & replace should be targeted at book view.
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