Community Tutorial: Hide the Actor/Mesh behind the invisible wall. Character invisibility, building effect (SUB)

Actor shield invisibility or character hide
Slow building effect
Using invisibility with cinematic (Sequence)
Once you have the template materials ready, you can use them for all actors and meshes.

https://dev.epicgames.com/community/learning/tutorials/xrpJ/unreal-engine-hide-the-actor-mesh-behind-the-invisible-wall-character-invisibility-building-effect-sub