7.10.4.5.  Mouse Interactions

Scroll wheel: Use the modifier key (CMD, CTRL) of your operating system in combination with the scroll wheel anywhere in a Treemap to zoom in or out at current mouse pointer position.

Left button drag: Drag the treemap around with left mouse button and SHIFT key pressed.

Hover: Hovering over a square/rectangle will open a tooltip showing additional information. That tooltip can be focused by clicking into it with a left mouse click.