In Flyme 6, the interface of Camera app is modified for you to access different fuctions easier, for example: you can slide to select Beauty, photo or Video mode, and HDR mode is list on the top banner for you to switch it on/off faster.
And there's anyther useful feature for you to adjust exposure compensation in auto mode: tap on the object you want to focus in auto mode, you will see an icon with "+/-", tap and hold it then slide up or down, thus you can adjust the exposure compensation level to get the best photo brightness, check the gif below:
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