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The ribbon button toggled structure protection silently. It now opens a Protect Structure and Windows dialog with an optional password; when a password was set, unprotecting asks for it and really verifies it (SHA-512, spin count 100000, salted). The password hash is read from and written to XLSX workbookProtection (workbookAlgorithmName/HashValue/ SaltValue/SpinCount or the legacy workbookPassword); an unreadable one stays locked. File › Info uses the same flow. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>