Where is the healthy use of Xiaomi mobile phone case?

Set time management in the screen. According to the website of the first perspective, "the function of healthy use of mobile phone provides three functions of application restriction of available time and sleep time, which can be set in the menu of healthy use of mobile phone-screen time management of mobile phone settings." The healthy use of Xiaomi mobile phone is set in screen time management. The healthy use of Xiaomi mobile phone is the length of time you set to use the mobile phone every day. After a limited time every day, some applications in the mobile phone can not be used normally, and the mobile phone will display the healthy use of the mobile phone.