If you are simultaneously working with the GraphViewer and the Statistical Viewer, you can easily switch between these two views using the shortcut icons in the lower left corner of both windows.
However, the two windows have also been designed to communicate with each other. The match currently displayed in the stattistical viewer will be displayed and highlighted in the GraphViewer by double-clicking the corresponding row (mouse device must be on the graph ID or submatch column) or by selecting the Open match in GraphViewer item in the context menu of the row (activated by a right mouse button click on the graph ID or submatch column).