From the 0.2.0 beta announcement (emphasis mine):
Quote:
Why a beta and not a Release Candidate as I’ve previously announced? Well because not all the features that I want in the 0.2.0 release are done. The biggest omission is the cross-file search: in the current beta, you can only search (and replace) in the currently open tab, but not across all the files in the book.
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So it isn't working in the current beta, but it will be implemented later.