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If you want to position the tooltip not relative to the triggering element, you should set position to be 4, 5, or 6:
4: center
5: top left
6: bottom right
If choosing 4, the x, y will be the offset to the center;
If choosing 5, the x, y will be the offset to the top left of the screen;
If choosing 6, the x, y will be the offset to the bottom right of the screen.