This is really a useful feature in case the user sends the wrong message.
According to previous information, to use the Unsend Message feature, users can access the message customization section. When selecting Unsend Message, a notification window will appear asking the user to confirm the retrieval of the message.
It is currently unknown when this feature will be officially released to all users. Readers can check the Messenger app update on the phone and update to the latest version to see if this feature is available.
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