Locking the phone app with Face ID or a fingerprint

You can lock the Sellit phone app so nobody who picks up your phone sees your orders, buyers or money. Open Profile → Security and turn on "Unlock with Face ID" (iPhone) or "Unlock with fingerprint" (Android); you confirm once with your face or finger to turn it on. In "Lock after" choose when the app asks again: Immediately, or after 1, 5 or 15 minutes away (1 minute when you turn it on). The app asks when you open it and after you were away longer than that. If your face or finger is not recognised, your phone passcode opens it too; the lock screen always has "Sign out", so you are never locked out — sign in again with an SMS code. Your face and fingerprint stay on the phone; Sellit never sees them. A face or fingerprint must be set up in the phone's Settings first. Signing out turns the lock off. The AI assistant cannot switch this on for you: it needs your own face or finger and the setting lives only on this phone, so this topic is answer-only.