The drag and drop feature enables you to quickly unmask elements in Modelio diagrams by just dragging them from the "Model" view into a diagram, as shown in the example below.
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Left-click on the element in the "Model" view.
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Drag the element into the diagram and release the mouse button.
Unmasking a class in a class diagram using the drag and drop feature
Note: You can simultaneously drag and drop several elements into a diagram by just holding down the "Ctrl" key, selecting all the elements in question in the "Model" view, and then dragging and dropping them all into the diagram.