Where is located config file of CKEditor?
Where to find CKEditor config in order to edit it?
If you use Drupal 8 or other ready CMS integration, please use Config Editor widget (in your control panel) instead of editing any configuration files.
If you have custom CKEditor 4 integration, find
config.js file in the directory of CKEditor.
Sometimes when you use some tricky custom CMS it can pass CKEditor configuration directly in
CKEDITOR.replace(el, config) function. Here you need to find where this config is generated and change according to code.