Important! Samsung has just released an important OTA hotfix which allows the user to set the password and setup their biometrics. It is available for the Galaxy S10 series.
After installing this update, you will be able to now lock the device and unlock it using biometrics and password.
The software version is G970FXXU3ZSJL, G973FXXU3ZSJL, and G975FXXU3ZSJL for the Galaxy S10e, S10, and S10+ respectively. The size is around 132MB. It also adds the November 2019 security patch.