① Use Illumination mode to change it.
Launch the app and press the "Light Up" button. Then select a color with the color picker, and the LEDs will light up in the color you chose. You can also change the color's shade by sliding the slider button located to the right of the color picker up or down.
② Change the color for the notification function
Tap the Notification Menu at the top of the Home screen, and it will switch to the Settings screen.
Select the color you prefer from color palette, and when you receive a notification, the LEDs will light up in the color you chose.