make mobile preview look closer to the default preview

I spent about two days trying to figure out why the mobile preview scene was so much darker than the default "Shader model 5"preview. It's purely because of the slightly too clever auto-exposure. In actuality my scene was dark and Unreal kept implementing its exposure compensation in the shader model 5 view, which would brighten up everything. So - it's not weird global illumination, or a stray light, or a weird emissive material - it's your view exposure.
Turn off the game settings check box and set your value to 1.0. That will show your scene for what it really is - and your mobile preview *should* look closer to your desktop view (I'm actually finding it a tad brighter now haha)


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