Visibility of 3D Inventory

Hi Guys

So I am working on a 3D inventory. (I dont want to use just a 2D style for it) So far I made an actor Blueprint with the mesh I want to use as a background and the inventory widget infornt of it. Afterwards I placed the actor infront of the FPCharacter’s camera with a child actor. I was not able to select a socket for it, maybe I’'m doing something wrong, this part is quiet unknown to me. Then I used Blueprint to set the visibility of the actor when the inventory is opend. But it didnt hide by default, and I was not able to moove forward. (Probably caused by the missing socket)

Some screenshots:

How it should look when it’s finishd.