How to remove the range extender? Short answer: just unplug it! Mine is now in the electronics junk drawer.
Longer answer: in order to get quality wifi bandwidth for video streaming you will not want to use range extenders, which are a poor performing band-aid for wifi.
In general, if you have a large space that needs wifi coverage, you want a mesh network. I was able to add another node to my mesh network with eero pro to solve the problem for the room with the Roku TV. There are other mesh wifi options out there.
