Hey, I changed the zenith and horizon colour of the sky sphere and the cloud opacity, in-game the clouds are gone like I wanted, however, the zenith and horizon colour of the sky sphere is still showing the default colours. How can I fix this problem?
In your Sky Sphere Blueprint, you have to uncheck “Colors Determinded By Sun Position” to override the settings under the Override Settings Panel. Otherwise it will use predefined Color Curves in the Engine for Horizon/Zenith/Cloud Color and Horizon Falloff. You can also find this in the Construction Script of the BP_Sky_Sphere.
For those of you still having this, the problem is in SkyLight. Every time you make changes to your atmospheric fog or directional light you have to Recapture your Skylight. Click on Skylight, go to Details and scroll down to Sky Light then click Recapture. You have to do this every time you make changes.