Three window modes in Windows: full screen, borderless and windowed. Full screen will take up the entirety of the current monitor with no menu bar. If the reso

Three window modes in Windows: full screen, borderless and windowed. Full screen will take up the entirety of the current monitor with no menu bar. If the resolution of the app doesn't match the monitor, it will either skew the content (common) or add a black border (uncommon) to fill the unmatched window space. Removing focus from a full screen app will minimize it to the tray. Games and some video players are typically the only apps that use full screen. Borderless is the same as full screen, except the content will not be minimized if the app loses focuses. Text editors/IDEs in "distraction free" mode, full screen mode for browsers and games set to borderless are typical use cases for this mode. Windowed has three icons in the top right with minimize, restore/maximize, and exit always on the menu bar in that order. The menu bar is draggable. Double clicking the menu bar will maximize or restore down the application. The notable exception to inconsistent behavior is the exit button. It used to be that the exit button would cleanly shutdown the responsible process. Devs now sometimes input a menu option that makes the exit button close the window while leaving the process running in the background. The app still resides in the system tray. Apps with this behavior are usually communication software (Skype, Slack, ICQ) or something that processes data in the background where a main GUI isn't always needed.