This Unreal Engine 5.4 video is about adding some UI and logic to the Build Helper Level.
We start by creating the Build Helper Widget Blueprint and accompanying Build Helper Tile Button Blueprint, which gets dynamically created based on the Tile Type Enum values. Next, we add some functions to the Build Helper Level Blueprint to Add (and Spawn) Tiles, Clear out the Tiles, and Load the Tiles from the Save Game Data designed in the previous video.
https://dev.epicgames.com/community/learning/tutorials/WDoX/unreal-engine-53-level-build-helper-2-let-s-make-a-tower-defense-game