The feature allows you to set passwords for the apps you want to secure.
Locking apps on Asus Zenfone 4 Max Pro is as follows:
Step 1: Long press on the home screen, select App Lock.
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Step 2: Set up your access code.

Step 3: Choose the application you wish to secure.
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Step 4: Enter a new access code each time you access the app.
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You can find helpful guidance in the video below:
Khóa app trên Asus Zenfone 4 Max Pro
Congratulations, setup is now complete! Wishing you all success.