What is the difference between the drill layer (44), the hole layer (45), and the milling layer (46) in Eagle PCB?
Electronic – Difference between drill layer, hole layer, and milling layer in Eagle
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It's hard to tell from the spacing but that hole is likely there so you can screw the regulator to the board, or more likely mechanically attach a heatsink.
You can see an example:
If there was copper you'd run the risk of connecting the tab to a trace or an internal plane. This wouldn't work so well if your internal layer contained a power plane.
You should be able to find a vertical part in Eagle if you prefer the voltage regulator to remain upright.
There is an User Language Program (ULP) for this, in the standard distribution. It is called drill-aid.ulp.
You run it on your finished PCB, before printing. it will make all the drilled pads smaller, making it easier to drill manually. As a side effect, you will get the requested function.
It will generate the extra copper in a separate layer, so that it can be removed and re-generated if you modify the board.
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