In the Video sync page, you can adjust several parameters like brightness, saturation and intensity to customize the sync effect to your preference. These values are saved independantly for each sync mode (Cinematic, Vibrant, Relaxation, Rhythmic) and apply to all lights in the TV area (including the TV backlight strip).

Brightness:

The brightness level of the lights. 

Saturation: 

The color saturation of the lights, from washed out (left of the slider) to most vibrant (right of the slider).

Intensity:

A combination of the transition speed betweenc colors and amplitude of the brightness change, from soft (left of the slider) to intense (right of the slider).

Note: If you want to go back to the default setting, here are the default values for the Cinematic, Vibrant and Relaxation mode.