Is it possible to change BP_Sky_Shere actor to be full blue, not a half blue?

Is it possible to change BP_Sky_Shere actor (Shpere) to be full blue, not a half blue (upper half is blue, the bottom half is solid white-grey color) in Unreal Engine 4.5?

Disable the Colors Determind By Sun Position -

Change the Zenith & Horizon Colors to match what you want.