Krusader seems like a great program (very similar to Total Commander in Windows). But it opens up a window which is wider/broader than the screen, and it seems impossible to shrink it. That is VERY unpractical. But I CAN change the height of the window. Neither is it possible to move the vertical line dividing the 2 panels. So what is wrong.
While opened Krusader you can try keyboard combinations for window manipulation:
Or move Krusader's configuration file with
and then relaunch Krusader. It should reset to default settings.