Use your controller even when you're not in-game or in Big Picture. Never leave the couch when using a controller with PC. Control mouse, keyboard and media player. No more getting up to muck about with mouse and keyboard to launch Big-Picture or the game you wanted to play. Mouse and Keyboard Control on the Desktop When Big-Picture is not running, you can control the mouse with the left thumbstick and scroll with the right thumbstick. Click the left thumbstick and you get keyboard input directly on the desktop with a nice arcade-style keyboard spiral.