Seems a lot of people here don't seem to have a clue why there are even options to use different screen modes. Do some research as above suggested. There are hardware configurations that borderless windowed mode has issues with. SLI/Xfire and Gsync among them which I use. There is absolutely no reason why the game should not minimize to the task bar when I tab out when using full screen mode, and stay minimized until i select it again. Right now the game pops up whenever I close any other window that might be open even when I don't select the game. The switching to a window bug with full screen that is currently happening also causes the monitor to go nuts trying to switch gsync modes and sometimes crashes. I would use borderless/windowed fullscreen if it benefited me but it does not. This was never an issue for full screen mode in dx9, and it needs to be fixed.