Comment 9 for bug 224229

* Move the Detect Displays button to the top right of the window, right of the Clone Screens checkbox.
* Look for and remove excess padding
* Shrink the vertical height of the graphical layout section

That should be sufficient.

Note that it would also be possible for the applet to compare the current screen resolution to the apps desired window size and if things look too tight, to hide or scale down the graphical display. However I suspect if the above steps are taken it should be possible to fit it into a 400 px height.