You can choose out of a list of the headers you wish to see in a message by clicking the icon in the central bar, or in the menu Headers\choice of headers to display. The next screen will let you choose the headers:

If you want to see a header, tick the box on the right of the name, if you don't want to see it untick it. Once the screen is validated the chosen headers will be shown in the messagebody.

Remarks :
- The special Face en X-Face (with picture) are managed via menu Headers\Faces en X-Faces.
- It is possible to add new headers by changing the file Entetes.arn you find this file in the folder Config.