Snap Windows allows you to arrange all your open windows using the mouse, keyboard, or Snap Assist feature.

Snap with a mouse

1. On your mouse left-click and hold on the title bar of the window you want to snap, and drag it to the edge of your screen. An outline indicates where the window will snap to once you drop it

2. Drag it to the left or right side of your screen depending on where you want to snap it to

Snap with a keyboard.

1. On your mouse left-click the window you want to snap and press the Windows Logo Key  + Left Arrow or the Windows Logo Key + Right Arrow to snap the window to the side of the screen where you want it to be. You can also move it to a corner after snapping it
2. With the window selected, press the Windows Logo Key + Up Arrow or the Windows Logo Key + Down Arrow to get it into the desired corner. The window is then in its smallest possible state, which is a quarter of the screen
3. Then you can use the Windows Logo Key + Arrow Keys to move it wherever you want. You will also see small windows on the right side as shown on image below that you can select any of the current open windows to fill in the space on the right of your screen

4. You now can have 2 or more windows open on the same screen

How to change Snap assist Settings

1. Right click the Start menu (1) and choose Settings (2)
   
2. Click on System
   
3. In the sidebar at the left of the screen, choose Multitasking (1)
   At the top of the screen, you’ll see a list of four options for Windows Snap Assist customization. You can customize settings to your liking.

• Arrange windows automatically by dragging them to the sides or corners of the screen. Disables Snap assist when Off
• When I snap a window, automatically size it to fill available space. This option prevents the second window from utilizing all of the available real estate in a side-by-side configuration
• When I snap a window, show what I can snap next to it. When off, Windows will no longer display apps, programs, or other windows that can be snapped into an available area
• When I resize a snapped window, simultaneously resize any adjacent snapped window. Resize snapped windows by automatically by default, or manually to your liking