@Balazs1: The Galaxy Tab A 2019 doesn't feature any native biometrics options, I'm afraid, however you can still keep your device secure with the traditional lock screen options via Settings > Lock Screen > Lock Screen Type, with additional options available via Smart Lock. Hope this helps.
Thanks your answear👍 However it's a shame from Samsung,actually there is no wake/sleep funkcion and any biometrics function at all,which should be a basic function in 2020,even in 2019 when I bought it! I have already really sorry to bought it.(anyway maybe it was my mistake,just didn't check every each function before bought it).I was too naive to assume it's a basic function like a servo wheel in a car at 2019-2020