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There is a way to change resolution of CK and playing in panoramic view? I have tried the trick that works for SC4 and I don't know if there is something more I can do.
Change resolution in the settings.txt file in the CK folder. I am not sure what exact resolutions are supported or how they look. But try some and see what it looks like.
I use 1680x1050 and the game looks fine. I think anything larger than 1024x768 makes the loading and menu screens have a lot of black borders, but the ingame map isn't effected.