Is there a feature to convert an Action to a Decision Node in an Activity Diagram?
You can right click on the Action and select Related Elements > Change Type to change it to other model types, including Decision Node. Please note that:
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This feature available only under Advanced UI Model (Window > Application Options > General > Environment > Advanced UI Model, then restart app)
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This feature available in Modeler Edition or above.
Feel free to contact me for any questions!