I found that the GUI did not like the 4:3 ratio. It would not expand when I clicked full screen at the upper right hand. I could right click on the top bar and select maximize (I think that’s what it was) and it will expand. But I could not minimize it and get back to the desktop if I needed. Which sucked if I needed to edit a file. I would have to exit Linux cnc and then re home everything when I launched it. But with the 16:9 I can expand and minimize it.