What exactly are you referring to Brian?
If you're looking for 4:3 material to "Fill the Screen", then you need to set the unit for 16:9 in the Menu and press the soft button just under the screen. That button is a toggle and will switch between Normal, Full and dark. If you hold it down for 2 seconds, it will invert the picture on the Screen as well.
You should always keep the unit set as 16:9 in the menu because it is a 16:9 screen.
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Ric Perrott