3D Quad not visible on Hololens2

Hi, I’m currently working on a project in Unity, but I’m still relatively inexperienced, so I have a question. I placed a UI button on a canvas, which is also displayed on the Hololens2. For this purpose, I have created a 3D slider and a quad on which I have added a blueprint as a material, since I am supposed to interact with a blueprint, i.e. rotate, scale, etc. Unfortunately, everything is displayed normally on the Hololens2 except for the construction plan/quad. Does anyone know why this is the case?