How does wechat display become a notice? How can wechat display become a notice

We use wechat every day. Now wechat is widely used. Sometimes wechat display becomes a notice. What's the matter? How to turn wechat display into a notice?

1. If you need wechat message notification, you can enter mobile settings - Application Manager - downloaded - wechat - display notification

2. Open wechat - click 'I' in the lower right corner - Set - receive new message notification / sound - slide to open (due to different versions of wechat, the operation mode may be slightly different).