Disclaimer: This option is only available to Android users.
By default, the Enter key on WhatsApp Messenger is programmed to add a new line between text. However, you can configure your "Enter" key to send messages in lieu of adding additional spaces.
Use the Enter Key To Send WhatsApp Messages
Open WhatsApp and go to Settings > Chat Settings:
Check the box that reads Enter is Send section:
The Enter key will add a new line option will change to Enter key will send your message.
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