How to split screen on Windows 10
To split the screen in Windows 10, drag a window all the way to one side of the screen until it snaps into place. Then select another window to fill the other half of your screen.
Drag one of the windows by its title bar to the left or right side of the screen. You’ll see an outline of the window appear — release your mouse and the window will snap into that outlined position.
You should now see all your other open programs appear in thumbnails on the opposite side of the screen.
Click one of the other program windows. It will snap to the other side of the screen, so you’ll have two windows side by side.