This seems like an easy fix. But ive been dealing with it for weeks. My build folder only has my Launch Images and icons. I already set the launch images in the iOS section (Though I notice my test phone which is an iPhone 11 is not listed in it). I even tried changing the engines default images to my Launch Images and it still Shows my Launch Image then Unreal’s Launch Image before continuing to my app. My client does NOT want this and i cant find a way to get rid of it. There is no documentation or forums on this seemingly small problem problem. Before 4.24 this was never a problem. This hapens in development and shipping builds if that helps.
Hello, have you solved your problem?
I have the same problem.
No we never found a way. The client just had to deal with it 
This problem persists in UE4.25 as well! My app first launches with the Unreal Logo splash screen, then after a few seconds display my actual splash screen. I’m not using a custom launch screen storyboard, just a default 2048 x 2048 launch screen image.