My SDL Trados 2015 all of a sudden got a separation between left and right columns (source and target). The columns scroll separately and have separate controls for scrolling, which is a problem to keep them together. I work on Windows 7. How could I get t

My SDL Trados 2015 all of a sudden got a separation between left and right columns (source and target). The columns scroll separately and have separate controls for scrolling, which is a problem to keep them together. I work on Windows 7. How could I get them back together?