@Cbob following the configuration instructions https://github.com/MichMich/MagicMirror#general you can add a section for passing to the browser, electron add that line in front of the modules: line this says, not fullscreen 800 pixels wide and starting (left edge is 0) at pixel 600 electronOptions: {fullscreen:false, width:800, x:600}, so, if your screen is 1920*2 wide to get the window onto the second screen, x:1920 seems right