How does oppor9s encrypt a lot of products?

I am an oppo mobile phone, and product encryption is actually an application lock. I will take my oppo k3 as an example to teach you how to set a password. The specific operation is as follows:

1, open the phone settings, find and click Privacy.

2. After entering the privacy options interface, click Apply Lock.

3. After entering the page, you must first enter the privacy password (because the system cannot protect the privacy screenshot). After entering, find Pinduoduo app and turn on the switch.