Finally in Samsung!

[crngv]

Been scrolling my settings app and found this "Pin Windows" feature. This feature helps you restrict the user exit the app until unlocked with a password.

• Go to Settings > search Pin Window or Pin.
• Slide the toggle to ON (the blue toggle lights up).

 Now in all the recent apps you can find the option "Pin this app".

• On the shortcut menu, tap "Pin this app" for the respective app.

That's it, you have now locked the user from accessing the back, home, recent, and switching to other apps.

To exit from the pinned app:

• Within the pinned app, swipe from the bottom (same gesture for returning to home) and hold for a couple of seconds.

The lockscreen appears with fingerprint unlock and the unlock keypad.