Wechat computer version, how to cancel the message, why can't I find the cancel function?

First of all, we need to open WeChat-Me-Settings-New Message Notification-New Message Notification and Notification to display the message details.

Open iPhone settings-Notifications-WeChat-Display in Lock Screen/Display in History/Display Preview-Always.

When these settings are turned on, even if a friend withdraws a message after sending a message, the withdrawn message will still be displayed in the screen lock interface. But you can't see it if you withdraw the map. This should be regarded as a small BUG in the iOS system.