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If you have ever clicked on the Send button then realised you shouldn't have, you may want to enable the Undo Send command. This feature gives you up to 30 seconds to stop a message from being sent after you've clicked on the Send button, and can be enabled via Settings.
To set the amount of time that a message can be undone for:
Click on the Settings cog near the top-right corner of the screen
Choose See all settings
Scroll down until you see the Undo Send option
Click on the drop-down arrow to choose how many seconds for which the Undo option will display after a message is sent
Click on Save Changes along the bottom of the screen
Now, when you click on the Send button, you will have a few seconds to click on the Undo link to stop your message from being sent:
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