You already know how to use the Maximize button to switch between a window and full-screen. Windows can be adjusted in a more granular fashion as well. When you move your mouse to a horizontal border, your mouse pointer will change to a ô. When you move your mouse to a vertical border, it will change to a ó. You'll see a diagonal arrow when your mouse is on one of the four corners of a window. Click and hold your left mouse button when you see this change in your pointer and drag to resize your window.

You have three ways of resizing windows using the borders:

Horizontal Border - resizes a window up or down
Vertical Border - resizes a window left or right
Corner Border - resizes a window up or down and left or right

 Hughes Glantzberg