The image brightness and screen preview darkens in low-light conditions when going from Wide to Ultra-Wide mode. Why?
You can take photos and record videos using various angles of view with the Ultra-Wide lens and wide-angle lens. The Ultra-Wide lens lets you take wide-angle photos or record wide-angle videos which look just like the actual view, and the wide-angle lens lets you take basic photos or record normal videos.
The device uses other camera modules for Ultra-Wide and Wide mode, so there are differences between the camera sensor and the F value for Aperture. Because of this, screen brightness may differ depending on the shooting mode and the surrounding conditions. It’s a normal operation and is not related to device performance.