Click on any visual element to select and filter information. Click again to deselect. Undo, Redo and Reset buttons are located at the bottom right. You can click on the 'buttons' in the middle of the screen (below the treemap) to display the treemap and stacked bar chart for the corresponding system; however, if you have already made a selection, you should also press 'Reset' (at the bottom of the screen) to ensure everything loads correctly.