Problem with dual monitors display when using draftsight

I have recently started to use Draftsight on my surface pro 4. The program displays well when using on my surface monitor, but when I drag the window on my other monitors, the window shrinks and its no longer possible to move, fully open or reduce its display. I can't even close the draftsight window other from closing it from the toolbar at the bottom of the screen. I found that it might be a graphic card or resolution problem. Anyone has any idea on how to solve this problem ? See attached for screenshot.