How do I disable the 'source code' in the editor in profile/forum?

Hi everyone, 

In our community, we do not want to make it possible for users to edit the source code when they create a forum post, reply and/or edit their profile.

It is in Tools > source code. 

I already saw some options to change the editor on:

  • Admin > Site > Editor Options
  • Admin > Moderation > Filtering 

But can not find a way to disable / delete this option in the editor/text field. 

Although I would like to disable this per section/group/forum, it is also fine if I can only disable this site-wide.

Any advice on how to do this?