Allows dragging the visible plot area along the X axis only, the Y axis only, or freely, changing the visible axis range.
If the movement is not constrained on one axis, then pressing SHIFT when panning will restrict the movement to X or Y axis only according to the direction of the initial movement of the gesture.
Scroll can be performed with a track-pad or a mouse wheel. SHIFT will lock the scroll on the prominent axis, while SHORTCUT (COMMAND on macOS, CTRL on Windows and Linux) will swap the axis (so with a mouse wheel will be possible to scroll on both axis).