Customize ckEditor config options

gistfile1.txt

<?php
// application/config/site.php
return [
    'sites' => [
        'default' => [
            'editor' => [
                'ckeditor4' => [
                    'custom_config_options' => [
                        'entities' => false,                // Disables conversion of characters to HTML entities entirely. Example: Stops converting © into &copy;, or & into &amp;.
                        'basicEntities' => false,           // Prevents encoding of “basic” characters like &, <, >, ", '.
                        'entities_latin' => false,          // Stops encoding Latin-based special characters (like ñ, é, ç) into HTML entities like &ntilde; or &eacute;.
                        'entities_greek' => false,          // Prevents encoding of Greek characters (like α, β, Ω) into &alpha;, &beta;, etc.
                        'htmlEncodeOutput' => false,        // Prevents CKEditor from encoding content on output (e.g., when switching between WYSIWYG and source view).
                        'forceSimpleAmpersand' => true,     // Prevents CKEditor from converting & into &amp; unless it’s part of a valid HTML entity.
                    ],
                ],
            ],
        ],
    ],
];