Level-Streaming/Opening like Dead by Daylight

So, if anyone here has played Dead by Daylight by Behaviour Digital; you might like it or dislike it, but anyways; they have some cool transitions and I’m wondering if someone knows the way to do it like them.
Like if you look at Tru3Ta1ent’s Video, you can see what I mean;the loading screen fades away(without any hitches/pauses in the game like other UE4 Games would have done)

I’ve tried a bunch of “Load Level/Stream Levels” and it just doesn’t work out as well as I’d like it to; I thank you in advance!

No longer needed.

Can I ask how you did it? Looking to do a similar thing for a game I’m working on