Provide App lock

[SIAB]

Why Samsung phones don't provide app lock.? This is not a basic feature? 

[UNKNOWNUSERNAME]

you can lock apps by using secure folder, then adding the apps into secure folder then adding to homescreen.
a very complicated solution for something that should be easy.

[AndrewL]

@SIAB: To access the Secure Folder, which will add an extra layer of security for your apps, please head to Settings > Security and privacy > More security settings > Secure Folder, and follow the on-screen instructions.