@Reolink-Fiona "May I know what's your camera model and firmware version?"

Reolink RLC-511WA fw v3.1.0.956_22041509 - 1 cam
Reolink RLC-520A fw v3.1.0.951_22041566 - 9 cams

Yes, I still have a problem with switching to color.

Reolink RLC-511WA fw v3.1.0.956_22041509 (one) and RLC-520A fw v3.1.0.951_22041566 (nine)
"Black & White and Color Switching Threshold"
Can't use this feature. At any position of the slider, the image does not change in any light. What does -50 and +50 mean? How to use this function correctly?