No Volumetric Fog in Game view? 4.17

Hi there

am a noob so probably missing something simple.

I can see volumetric fog when Game view is off. When Game view is on I cannot see any fog. Is this a bug or something I need to change so I can see fog in Game View?

I’m using LandscapeMountains to play around with the trueSky demo. I’m just trying static shots at the moment.