PLEASE!! Remove "Synchronize styles accross book" button
PLEASE!! Remove "Synchronize styles accross book" button or at least add a "are you sure" confirm button.
This is an irreversible action which can mess all documents within a book without the option to undo it.... AND IS NEXT TO "SAVE BOOK" BUTTON.
You are just one pixel away from destroying your project instead of saving it!
This is nuts

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Janus Bahs Jacquet commented
The two options are ten options apart in the book options menu. The sync option is in a whole section of its own containing only “Synchronize [Book/Selected Documents]”, “Synchronize Options…” and “Update All Cross-References”.
An “Are you sure?” button would be good, since it’s not intuitively obvious that any book documents not currently open will be altered and immediately saved with no further prompt, but you are definitely not just one pixel away from destroying your project instead of saving it.