Most monitors can display different size grids so you can adjust them the way you like best. When you first buy a computer its usually set up to have a screen area that displays 640 x 480 pixels. Most monitors can handle 800 by 600 pixels and if you've got a better graphics card you may be able to display 1024 by 768 pixels. This means that by increasing the resolution, you will be able to fit more graphics and text on your screen. You may not have to use the scroll arrows as much to see stuff on the right hand side of your screen.
Lets do a test.
Close any other open applications if there are any open. Right-click on the desktop and choose P r operties to bring up the Display Properties dialog box. This is where all your screen settings are modified. Click on the Settings tab at the top. You should see an area called 'Display area' with a slider bar.