Long press any network user, a pop up window will allow you to input name for the user. Those two users won’t be able to talk to each other, eg: apple TV, Google TV, Xiaomi box, cut off the phone connection to those boxes and it will disable screen cast like feature. as long as you connected to any internet network, ’s NetCut can work. If NetCut reports you are not running as root, ref here for How to Root your Android Phone
Note: NetCut require root to run, otherwise, it won’t be able to run. On Your Google Smart Phone: Free, Fast, Powerful, Easy to Cut, Easy to Protect