You can choose between Password, Fingerprint, Face ID(iPhone X) to unlock your wallet, you can also opt to not lock the app. Additionally, you can change the auto-lock timer to allow for a duration spent outside of the app until the app will lock itself and require you to unlock the app again when you open it. You can find these options in the settings menu for the wallet.
Only devices that support the Android Fingerprint API will have the Fingerprint unlock available to select. Older Samsung models may have fingerprint unlock on the device but may not support Android Fingerprint API, so the option will not be available in the Enjin Wallet.
Note that you will still NEED to remember your Password to send funds and view your Recovery Phrase.