Screen Options

You can find Screen Options pull down tab in the upper right corner of your Dashboard (WordPress admin panel):

It is a fly down menu button. When clicked, Screen Options menu shows options to configure the view of that particular page in your admin area. Screen Options contain check boxes to show and hide different sections of an admin screen. They also contain the option to choose the number of items to display on the admin screen.

You can see how Screen Options look:

On the back end of Pages:

On the back end of Posts:

You can find more information on how to use Screen Options from this link.