● Line-by-line (ratchet) mode — ideal for precise navigation of items and lists.
● Hyper-fast (free-spin) mode — near-frictionless spinning, letting you fly through long
documents and web pages.
Switch modes manually
You can also manually switch between modes by pressing the mode
shift button.
By default, mode shift is assigned to the button on top of the mouse.
Use the Logitech Options Software, to disable SmartShift if you prefer
to stay in a single scrolling mode and shift manually. You can also
adjust the SmartShift sensitivity, which will change the speed required
to automatically shift into free spinning.