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1. after opening wechat, and then opening task management, you can press and hold wechat to pull it down, and it will show that there is a lock, and then pull it again to unlock it.

2. In the task management, there will be options after long-press WeChat. You click the lock to lock it, and then click the lock to unlock it.

3. open the security center → application management → permissions → self-initiated management → wechat → open.