Thanks for the warm welcome everyone.
Sorry I took so long to reply.
So I’ve been working on your suggestions and trying to fix this. Now when I say “Black” what I mean is that it becomes like when you make a new level without the starter content.
Now I’ve just realised that when I started adding in landscapes my atmospheric fog also disappeared. As in it is there in the scene outliner but not the viewport. I set it up, didnt touch it after that because I had difficulties with the lighting system so left it as the best i could get it. But I’ve noticed it doesnt appear anymore in the viewport. Same with the landscape yet tehy show up in the outline. I tried rebuilding everything and changed from lit to unlit, checked details but I can’t figure it out