There’s multiple ways to implement Fade In/Out so this might be a bit hard to figure out. But I would start by searching all Blueprints for “Fade” by doing the following :
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Open a Find in Blueprints window by going to Tools → Find in Blueprints → Find in Blueprints 1
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In the search bar of the Find in Blueprints window, search for “Fade”.
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It will bring up a bunch of stuff that includes fade in it.
[This will bring up different results based on your project] -
I would first look for “Start Camera Fade”, “End Camera Fade” etc. That’s the main way to add a fade effect.
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You can double click any of the results marked with
or 
or 
to go to where it’s implemented and remove it.
But, this might not work if the fade was implemented using a Level Sequence. If that’s the case, there might be a fade track in the sequence you’re trying to render.