This Unreal Engine 5.4 video is about using an Editor Utility Widget to help Build a Level.
We start by creating a Tile Type Enum in C++, which we use with an Int Vector Map in the Build Helper Save Game Blueprint. We then create a Build Helper Editor Utility Widget Blueprint which will Load that Save Game data and use it to Spawn some Static Mesh Actors. Next, we create the Build Helper Leve, which will be fleshed out over the next video or three, and follow that up with some temp data to ensure the Editor Utility Widget is working.
https://dev.epicgames.com/community/learning/tutorials/6XV5/unreal-engine-52-level-build-helper-1-let-s-make-a-tower-defense-game