I have dual screens, with the following graphic card :
00:02.0 VGA compatible controller: Intel Corporation 82Q35 Express Integrated Graphics Controller (rev 02)
In order to be able to use gnome-shell, i have to have a maximum definition of 2048 pixels (height or width), my two screens are in 1280x1024.
To be able to use my dualscreen, i have to set them vertically.

My problem is that the notification bar at the bottom of the top screen appears at the top of my bottom screen when the bar is hidden.

I attached two screenshots side by side, one with the panel hidden, and one with the panel out.