Change Segemented Dimmer blend mode in Unreal?

When I steam using the Hub, a big black box covers most of the screen. I found this post which I think is the same issue but the fix is for Unity. How do I set the blend mode to alpha in Unreal? Thanks.

I am not sure if this question is for me or not, but I have never used Unreal and I have no idea.

Thank you. I’ll try this.