Grabber / splitter controls
In the main window are splitter controls that collapse. There are blue triangles on the grabber bars that indicate the direction that the splitter will collapse to if clicked. Alternatively, the splitter can be dragged into the position that you want. The positions of the splitters will be persistent between shut down and restart. First time users may become confused if not aware of the fact that these splitters can be flush with one side or the other of the main window.