When I use my Steam Link, the game is displayed on my host pc too. It takes a lot of resources and I don't see it so it's completely useless. So I would like to know how I can display the game only on my Steam Link client?
As CommandoAir says, thereis no point in that. Your PC is rendering the game only once, and then Steam streams that video to your Steam Link. It doesn't take any "Extra resource". If you want it off, you can turn off your screen.