Why is it that it’s already daytime, but the device preview on my homepage still shows the night vision picture?

The camera itself has infrared and full-color mode switching, which requires trigger conditions. If you use the device in a dark scene, it will maintain the infrared black and white mode for a long time. You can place the device with sufficient light or turn on the lights in the room to let the camera sense. After that, it will automatically switch to full color mode.