1. Snap a window to the right or left side of the screen. MORE: How to Turn on Hey Cortana in Windows 10. 2. Resize the window to make it narrower or wider. 3. Snap another window to the other side of the screen.It will fill all the available space, making it bigger or smaller than the first application you snapped.. Snap a window to the right or left side of the screen. MORE: How to Turn on Hey Cortana in Windows 10. 2. Resize the window to make it narrower or wider. 3. Snap another window to the other side of the screen. It will fill all the available space, making it bigger or smaller than the first application you snapped.