When you snap a window to use one half or one quarter of the desktop, Windows 10 assumes the next thing you want to do is snap another window next to it and shows these thumbnails. That's handy if you do want to snap another app, but annoying if you were happy with the way they were already laid out on-screen. If you size a window so it's more or less than half of the screen, snap will usually work out that you want to use the rest of the screen for the window you're snapping, but not always. It depends on how soon after you resize a window you try to snap another window next to it. Generally, the new snap features sound useful, but are a little too clever for their own good in practice.
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