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If any of you use the "show windows stacked" or "show windows side by side" command, you may have run across Windows 10 not arranging the windows the way you might expect it to - especially if you used this feature in Windows 7 or 8(.1). I finally found what causes the arrangement to be off.
Click on Start -> Settings -> System -> Multitasking.
From there, turn off the feature "When I snap a window, show what I can snap next to it."
If that feature is left on, chances are that the windows end up stacked and piled in the left side of the screen, even if you opt for the "show windows side by side" option. Disabling that feature in the Multitasking options allows the windows to use up more real estate on the desktop.
Click on Start -> Settings -> System -> Multitasking.
From there, turn off the feature "When I snap a window, show what I can snap next to it."
If that feature is left on, chances are that the windows end up stacked and piled in the left side of the screen, even if you opt for the "show windows side by side" option. Disabling that feature in the Multitasking options allows the windows to use up more real estate on the desktop.