Snap is a quick way to re-size open windows, simply by dragging them to the edges of your screen. Depending on where you drag a window, you can make it expand vertically, take up the entire screen, or appear side-by-side with another window.

To snap: left click and hold the top of a window pane and drag it to the left, right or center to snap it into place. Drag it back to the center to set it back to the original size.