How to change the black background AD PCB file

1. Step one: Open AD software file create a PCB.

   
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   Step Two: In the black area just draw a closed polygon - note it must be closed!

   
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   Step 3: Click "Ctrl + A" shortcut to PCB entire file is selected.

   
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   Step 4: Click the menu bar of the "Design" -> "Board Shape" -> "Define from selected objects".

   
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   Step five: general software will pop up a dialog box that probably means that tells you "can not find enclosed in the original image at the center line, you do not try to look outside the center line", click "Yes" to.

   
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   Step Six:'re done! Consistent with a black background and just draw a closed area.