WoW:UIOBJECT WorldFrame

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WorldFrame is the frame that displays the 3D world. You can have only one instance of WorldFrame. There is not much you can do to a WorldFrame, so it is best to leave the WorldFrame object in WoW alone.

Pasted from WorldFrame.xml

This special frame is used to render the world.
There can be only one of these frames!!
The world is rendered in the background of the frame.
Children of the world frame are visible even when the UI is turned off.

You can move/resize this frame by doing something like the following:
/script WorldFrame:ClearAllPoints(); WorldFrame:SetPoint("TOPLEFT", 32, 0); WorldFrame:SetPoint("BOTTOMRIGHT", -32, 32);
which is wide-screen aware, or...
/script WorldFrame:ClearAllPoints(); WorldFrame:SetWidth(960); WorldFrame:SetHeight(736); WorldFrame:SetPoint("CENTER", 0, 32);
which assumes 4x3 aspect ratio...
You also can type: 
/script WorldFrame:SetScale(value) Default is 1. This only affects Nameplates and will not be saved through relogs or ui reloads.

If you want to have the WorldFrame size/position saved, you can do:
/script WorldFrame:SetUserPlaced(true);

If you want to reset the WorldFrame's size and position, you can do:
/script WorldFrame:SetUserPlaced(false);
and then log out or reload the UI