Board Thread:Support Requests - Getting Technical/@comment-33800918-20170722004549/@comment-26923519-20170723152540

There is no magic word for disabling VisualEditor. Also, if you wanted it as a site-wide change, I'd recommend not to, otherwise, newbie editors will have a hard time editing the source of an article, so that's why the VisualEditor can't be disabled, not even personally.

If you like, your only option is to go to your preferences, than click the editing tab, and choose your favorite editor.