See your linked devices, rotate your sync key
Manage which devices are using your sync, replace your sync key, and confirm before restoring on a fresh install.
Three things land together that turn your sync key from a permanent “leak it and they lurk forever” credential into something you can actually manage.
Manage devices. Settings → Sync now lists every phone and tablet currently linked to your sync, with the device’s real model name and when it was last seen. Spot something you don’t recognise? Unlink it from there. Replaced an old phone? Unlink all the others in one tap.
Rotate sync key. If you think your sync key may have leaked, a new biometric-gated tile generates a fresh one. The old key stops working, every other device is unlinked, and the new key is shown on screen so you can save it. Your data stays put on the server — this is a credential rotation, not a wipe.
Restore-from-key, with a check. When you paste a saved sync key on a fresh install, Again now asks you what to do about the other devices already linked. “Keep all” rejoins the mesh as before; “Unlink other devices” is the right pick after a key leak. Quiet fix for what was previously a back door past the time-bound link- code flow.