New nodes for selected nodes gets created when ctrl key is pressed

In my diagrams, when any node is selected and tried to re-position same with mouse but ctrl key is pressed on keyboard,
then instead of moving the node new node gets created.
(Same happens when ctrl key is pressed and use tries to move the node, copy of node which uses tries to move gets created)

I need to disable this behaviour. How this can be disabled ??

Set DraggingTool | GoJS API to false. For example, in your Diagram initialization:

  $(go.Diagram, . . ., {
      "draggingTool.isCopyEnabled": false,
      . . .