Can anyone tell me how to fix this annoying issue ?? Thanks
@3dRaven can you check this video please and let me know what’s going on here!!!
Try going to project settings → general settings and search for near clip plane. If it’s set to zero it can behave weirdly. Try anything slightly above like 0.1 and see if it fixes the issue. The engine needs a restart for it to take effect.
Also check your fog start distance, if it’s set to a higher number and “near fade in distance” is set to zero you will get a hard border of the fog in front of your camera.
@3dRaven I changed Near Clip Plain into different variables and that didn’t work and I changed near and far and I am still seeing this gray line. Please look at the video and let me know if there’s anything else I am missing. I have been trying to figure this out for the last 3 days. I have looked everywhere online and I still haven’t found the solution yet. If I don’t figure this out soon, I am sure I will see this in my dream 
Thanks again for your help.
A near clip plane of 10 means the scene will start rendering at 10 units away from the camera source.
Does the effect remain if you temporarily delete the height fog?.
I want to narrow down if it’s the fog or skylight rendering.
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Where can I access to height fog? Apologies, I forgot to mention you this, If I hide the Sky Atmosphere the grey line seems to go away but it comes back when I go into play mode.
Seems this thread had a similar problem regarding skylights in the end. Was something about the height setting of the world.
Found a video that mirrors your situation with a fix
@3dRaven unfortunately it didn’t work. I tried it so many time juts like he is doing in the video…
Yessssssssssssss, I figure it out finally. It was the BP LightStudio. @3dRaven thank you so much man for doing your best to help.