Windows: Windows 10 makes window management pretty easy thanks to its accessible shortcuts — the WIN key plus the arrow keys — but certain apps just don't like to play nice. Whether it's an older game from your childhood set to run at a certain resolution, a newer game that isn't configured to cover your entire screen, or a TV show if you're using your screen as a monitor, Fullscreenizer is what you'll need to make sure you're focused on one thing only: the biggest window on your monitor.
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The free Fullscreenizer app lets you embiggen a window and grant it full-screen characteristics, which will not only take over the entire display, but hide any notifications or pop-ups your computer would normally hit you with during gameplay. You can download Fullscreenizer here and run it after you extract it. You'll see a list of available windows you can "fullscreenize" and you can refresh the list when you launch your app of choice.
You can easily Alt-Tab out of your fullscreen window, or hit the WIN key to get your hands on the start menu again, making it easy to either exit fullscreen mode to look something up, or hide the fact that you're slacking off from your coworkers.