>lately we have discussed the new preview window.
>
>What do you think about a resizable message area, so that I can adjust it in height? The value in the settings could remain as a start value. Reading and editing of messages might be much more comfortable.
>
>I have no idea if this is possible, but that might be great. The preview could remain in the main window, since this might be much higher, so one can read both preview and input.

You control the height of the message frame with Account\General settings in the "Upper frame height in percentage".

The preview has been moved off the based window to be shown in a div. It will not be reversed.