Locking App issue @J7 Prime

[ZAngrazyJatt1]

Hi Samsung,  I'm using dual WhatsApp messenger, my second WhatsApp is not being protected by locking app feature.
Please give me your technical advice,  thanx you. 

[Raviijangra]

use secure folder for using a locked whatsaap

[Shiv9564]

Secure folder may help you.

[Shiv9564]

Secure folder may help you.

[Shiv9564]

Secure folder may help you.

[YRSS]

use secure folder

[AyushRaj]

use Samsung S Secure app for locking