To re-size the displayed window on a computer screen, you have a couple of options. If you want to maximize the screen, you can click the button with the square, to the left of the X, in the upper right corner of your screen. To go back, just click the same button again. To give the window new dimensions entirely, put your mouse in one of the corners of the window you are viewing. When the mouse pointer turns into an icon of a bidirectional arrow, left click and hold, then drag the mouse to re-size the window, to the dimensions you prefer.