Game looks like ..... help

So i have this problem:
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But it isn’t only with the fog…
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If it is night time it looks a lot better(brighter) if you are looking simply through the viewport rather than if you are playing, what i causing this complete difference between modes? How can i fix this
(i want the in-game-view to look like the viewport-view)

At first sight - it looks like a problem with tone mapping. Try to disable tone mapping completely (you can do it in the Rendering Settings in Post Process section) and check if it helps.