Settings > Motion > [Camera Name] > Advanced section > Motion Sensitivity Slider
Use the Motion Sensitivity slider on the Settings > Motion tab to adjust the level of motion sensitivity for each camera. Use the slider to reduce [–] or increase [+] the motion sensitivity for the selected camera.
The further you reduce the sensitivity along the bar, the less sensitive the camera will be. It will detect motion only by large objects such as a person or car. The more you move the slider to the [+], the more sensitive the camera is — it will capture the motion of small objects such as birds, small animals, leaves blowing in the wind, or even a passing cloud.
To make your setting, you can simply slide the motion sensitivity slider right or left.