App lock: why there is no way to set a PIN, only remove one

Setting a PIN was removed from this build. The App lock card only appears at all if an older version already set one, and it holds a single Remove PIN button with no recovery.

Last checked against the app on · View as Markdown

Steps

  1. On a fresh install, Settings, System has no App lock card. That is correct: there is nothing to configure, because a PIN cannot be set in this build.
  2. If you set a PIN in an older version, the card appears with one control: Remove PIN.
  3. Removing it takes effect immediately and the card then disappears, the same as a fresh install.

How to tell it worked

Once removed, launching NeuralVault goes straight to the app rather than a PIN prompt.

If it does not work

You set a PIN in an old version and have forgotten it.
There is no recovery of any kind: no forgot-PIN link, no reset. The unlock screen backs off further after each wrong guess, up to a five-minute wait, but a forgotten PIN is not recoverable through the app. This is the reason the ability to set one was removed.
You want to set a PIN and cannot find where.
It was deliberately removed: a PIN with no recovery path could permanently lock someone out of their own plain-Markdown files. It may return with a real recovery path in a future version; it is not hidden somewhere in this one.