The 'mode' for runtime EntityDisplay objects used to render entities with arbitrary display options rather than a configured view mode or form mode.
@todo Prevent creation of a mode with this ID https://www.drupal.org/node/2410727
const CUSTOM_MODE = '_custom';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityDisplayBase.php/constant/EntityDisplayBase::CUSTOM_MODE/8.1.x