SGP main window does not maximize

Hello,
the following issue exists for quite a while but since it is a bit annoying I am posting it now. The PC that is runnning SGP has no monitor connected. I start SGP from a batch file automatially when the PC powers up. After everything is running I connect via remote desktop and I see the following desktop.

The SGP main window is no longer maximized and I also cannot maximize the SGP main window to the full monitor resoluton of 1920x1080. I can make the window smaller but not bigger as seen above.
All the docking modules are located at the same position as the PC was powered down and they occupy the entire monitor resolution.

Dietmar