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I cannot find the checkbox for "Allow connections from lines".

I used to deselect this checkbox because I usually put many objects inside a one big object. For example, I first draw the first box for a UML class and put the second box for another UML class inside the first box. Then, I want to draw UML interface (lollipop line) attached to the second UML class notation. But if "Allow connections from lines" is selected, this lollipop connection keeps connecting to the center of the first box. I tried to select the first box and clicked 'Delete Magnets", but the center of the first box is regarded the unbreakable magnet, so my lollipop connection keeps attaching to that magnet.