The resolution of the main screen of Z3 and T3 is 1024*768. When the display is in Copy mode, the resolution of the secondary screen copys the resolution of the main screen. As the default resolution of the 11.6 " 2nd screen is 1366*768, there will be black area on the edges of both screens.
You can set the display to Extended mode, with the main screen resolution to 1024*768 and the 2nd screen resolution to 1366*768.
If you really need to use Copy mode, you can choose the 9.7 " 2nd display, and then the resolution for both the main and 2nd screen is 1024*768, perfect for the copy mode.
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