Where are the security and privacy settings of Xiaomi 9?

For systems below MIUI7, open Settings → Other Advanced Settings → Security Privacy.

For systems above MIUI8, open Settings → More Settings → Security Privacy.

Security and privacy options are as follows:

Features available for security and privacy:

1. Set the unlock password: after setting the lock screen password, you don't have to worry about the phone being stolen, and people can easily use your phone, at least after clearing the data. After clearing the data, some software data is also cleared, so don't worry about the data being used.

Open the settings, find the screen lock password and set the screen password.

2. Application lock: Use the access restriction of the system to encrypt the software that you don't want others to access. Enter settings, security and privacy, visitors and access restrictions, and then click Open.

3. Private message: Open the information page, slide your finger down, don't let go, slide it several times alternately, and you can open it. Private message.

4. Album encryption: first open the gallery, click the cloud button in the upper right corner, and then slide down to enter the private album (note: turn on the cloud album function for the first time).