We had a code for HomePage pagetype like so:

<?php
class HomePage extends Page {
    static $db = array(
	'Description' => 'Text'
    );
    static $has_one = array(
	'Photo' => 'Image'
    );
    function getCMSFields() {
        $fields = parent::getCMSFields();

        $fields->addFieldToTab('Root.Content.Main', new ImageField('Photo'), 'Content');
        $fields->addFieldToTab('Root.Content.Main', new TextField('Description'), 'Content');

        return $fields;
    }
}
class HomePage_Controller extends Page_Controller {
}
?>

1. For Removing the content u need to remove the content from the main tab using code:

   <?php
   class HomePage extends Page {
       static $db = array(
   	'Description' => 'Text'
       );
       static $has_one = array(
   	'Photo' => 'Image'
       );
       function getCMSFields() {
           $fields = parent::getCMSFields();
           $fields->removeFieldFromTab("Root.Content.Main","Content"); // removes the content from cms tab
           $fields->addFieldToTab('Root.Content.Main', new ImageField('Photo'), 'Content');
           $fields->addFieldToTab('Root.Content.Main', new TextField('Description'), 'Content');
   
           return $fields;
       }
   }
   class HomePage_Controller extends Page_Controller {
   }
   ?>

2. After changing the code use yoursite.com/dev/build?flush=1

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