The window enlarges to fill the screen and the Maximize button changes to the Restore button.
INTRODUCTION
You can enlarge (maximize) a window so that it fills the entire screen. Doing so gives you as much room as possible to work in that window.
TIP
Restore the Window
You can restore the window to its original size. To do so, click the Restore button.
TIP
Moving and Resizing Windows
Note that when a window is maximized it does not have borders so you cannot move or resize it, as covered in the next tasks . To resize or move a window, you must restore it so that it has borders.