Oculus Home-custom elements

Hi, I imported a custom model component into my private Home but now I can't grab it to move it and try to delete it. I even created new Home to see if it still persists and yes they do.

In addiction, I cant' import any complete models because they are too big, I'm trying to reduce them by recalculating the meshes but they still big. I'm using Siemens NX to create the model and Keyshot 10 to transform and reduce the surfaces, but the reducing it is not enough whitout deforming the surface.

Has anyone else run into this issue and know of a solution?