Question about Stadler Form Peter

Hi, I have not discovered a way to turn this light off yet. I purchased this fan a couple weeks ago. The blue light on top, I have been resting a book on top of it to block it. The blue light coming through the vents in front does turn off on its own after a few seconds.

To switch off the LEDs, press and hold the "Natural Breeze" button (second from left) for about 3 seconds until the acoustic signal sounds. The operation must be repeated twice (the intensity is reduced the first time, the LEDs are switched off the second time).