If the image from your doorbell or camera is displayed in black and white during the day, the infrared night vision function is probably set to OPEN. If you set this function to automatic, the night vision function only becomes active as soon as it gets dark.
You change this function as follows:
Start in the 'My Home' tab
Tap the doorbell/camera in question to open the configuration menu
Tap the 3 dots or pencil symbol in the top right, a settings page opens
Scroll down to 'Infrared night vision function' and tap it
Here, select: 1) Automatic - Night vision mode becomes active as soon as it gets dark 2) Close - Colour image is displayed day and night 3) Open - Black/white image is shown day and night as night vision mode
Tap the arrow (<) at the top left 3 times to return to the 'My Home' tab.