As explained in
it seems there is no way to disable an editor field.
Check if TinyMCE issues are resolved by upgrade
This issue was assigned to me, however I will not be able to work on this issue in the immediate future. In order to create a truer sense of the state of this issue and to allow other developers to have chance to become involved, I am removing myself as the assignee of this issue. For more information, see http://docs.moodle.org/dev/Changes_to_issue_assignment
Fixed long time ago, thanks for the report.
Thanks Petr for the clarification.
Can you address me to a working example, please?
What example? Go to the list of editors and click eye icon.
Aah, I was reading it wrong, reopening.