I was trying to add fog using the lighting settings in window -> rendering ->lighting settings and for some reason this happened(see document) and i can't go back and i tried setting all the settings to how they were before but nothing happened. please look at the document i have attached with the before and afters of my scene.please help asap this is due so soon!!
Can you perhaps describe what is going on, maybe just post some screencaps? Not everybody is going to open a Microsoft DOCX and I'm honestly surprised the Unity site even let you upload it.
Are you baking the scene lighting in advance? If you use the auto-bake in the editor, there are issues where it doesn't look right when you switch scenes. Not sure if those issues ever got fixed. Does it look better when you build an actual binary to run outside the editor? This is the specific workaround if that's the case: