damian2:automatic preview
4 years ago (2. update 4 years ago)
(See below)
as for 20081201 version, there is an automatic preview with a frame.
How i can toggle on/off this feature? There are some issues like the position of the right-button menu and the streching of the layout.

responding myself:
There is a setting in "customize.inc.php":
confChange('TASKDETAILS_IN_SIDEBOARD', false);