For extra security, you can set a password for a Pages, Numbers, or Keynote document in macOS. With the file open, choose File > Set Password. But what if you forget that password? This is common if you have a Mac with Touch ID and rely on your finger to bypass entering whatever secret you set. (Read to the bottom for a significant warning about this feature, however!)
When you create the password, you see a different option depending on whether you are on a computer with Touch ID available and enabled or not.
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Without Touch ID: A checkbox lets you choose to “Remember this password in my keychain.”
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With Touch ID: You can opt to “Open with Touch ID.”
