Lenovo tablet/Android as wall panel

Hi, I recently added a Lenovo M10 tablet as a wall panel to my set up. It works great with Kiosk. However, I have tried absolutely everything to stop the stupid smart cast pop up coming up and it still stays. I have Bluetooth off, casting off, tried disabling all sorts of notifications etc. Does anyone know please how to stop it coming up on top of my kiosk screen.

Thanks!