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Yes, it is possible to disable the automatic line-breaking feature in the textarea section of the Joomla Backend by using custom CSS.
You can add the following CSS code in the template's custom CSS editor or in the Joomla Global Configuration Editor:
textarea { white-space: pre !important; }
This code will override the default white-space value and set it to "pre", which means that the text will be displayed exactly as it is entered, without any automatic line breaks.
Note: This will affect all textareas on the website, not just the Joomla Backend. If you only want to disable the automatic line-breaking feature in the Joomla Backend, then you will need to add more specific CSS selectors to target only the textarea elements in the Joomla Backend.