You could find the key from the laptop’s user guide or directly seek it (the key with touchpad icon) among F1-F12 keys. To unlock the Windows 10 Lenovo Yoga touchpad, you need to find the function key for the touchpad. Therefore, if the Windows 10 Lenovo Yoga touchpad still can’t be used after restarting the Lenovo laptop, you can check if the touchpad is in unlocked status firstly. Sometimes, an unavailable touchpad may be caused by accidentally locking the touchpad.
Unlock the Windows 10 Lenovo Yoga Touchpad with Hot Keys