To get an activity to cross a swimlane boundary, use the Ctrl (Control) key, as follows:
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Select the shape (click on it).
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Press and HOLD the Ctrl key.
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Place your cursor over a dark square at the bottom (or top) of the selected shape. The cursor changes to a rectangular shape with a line through it.
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Press and HOLD the (left) mouse button.
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Drag (move) the mouse until the shape crosses a swimlane boundary.
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RELEASE the MOUSE button FIRST, then release the Ctrl key.
Once you have caused a shape to cross swimlane boundaries or borders, you can now cause it to cross more borders without having to use the Ctrl key; using the Ctrl key with the steps above will also work.