Actors are disappearing while moving the camera

Hey there,
im new to Unreal Engine and I am currently try out some things with this engine.
I tried to create a world of blocks. It worked with good performance, but in my example there are 16tsd of actors spawned in the scene and they are disappearing all the time far away and near the screen borders while moving the camera. How can I stop this? It is really annoying :confused:

Thanks for your reply, but I think Cull Distance Volume is something for optimization of the scene to make actors disappearing, but in my case the actors should not do that.
Nevertheless I tried to solve this problem with this Cull Distance Volume and you see nothing changed:
As I already said, I am really new to this Engine and I am learning by doing, but this kinds of problems scares me off.