You can secure your privacy by locking the apps you desire.
Lock Apps on Vivo V7+ with the following instructions:
Step 1: Navigate to 'Settings' and select 'Fingerprint, Face, and Password'.

Choose 'Fingerprint, Face, and Password'.
Step 2: Select 'App Security and Encryption'.

Select 'App Security and Encryption'.
Step 3: Set the lock password.

Set up the lock password.
Step 4: Select the apps you want to lock.

Select the apps you want to lock.
Congratulations! You've completed your setup process. Wishing you success.