ght', classes: 'left,right' } }, disallowedContent: '*{title*}' } );

This editor is using a custom configuration for ACF. It's using the Disallowed Content property of the filter to eliminate all a and img tags, while allowing all other tags.

CKEDITOR.replace( 'editor7', {
	allowedContent: {
		// Allow all content.
		$1: {
			elements: CKEDITOR.dtd,
			attributes: true,
			styles: true,
			classes: true
		}
	},
	disallowedContent: 'img a'
} );