Thanks for your help! I left a comment in https://www.question2answer.org/qa/66264
. In brief, I followed all listed steps, but nothing changed. I still have my old editor.
UPDATE. It finally worked. In order to enable it, I used config.js from the new version of CKEditor. Despite the fact that you recommended to merge or replace this file with the old one
"Theoretically, you should merge the files ckeditor/styles.js and ckeditor/config.js from the Q2A CKEditor and the new one. If you don't know the word merge then plan B would be to replace those files in the new CKEditor with the ones from the Q2A CKEditor"
HOWEVER, I still have an issue. Somehow formatting (text highlighting) works only when I edit the answer. Once the post is saved, the font is pale
Here is the screenshot: https://ibb.co/z78LpXW
And this is how it looks when I am in the editing mode: https://ibb.co/3MfwrVZ
Any ideas why the code is pale?