There is no way to place an item beyond the displayed parts of the diagram, meaning there is nowhere to place it when existing items take already more than all the displayed place.
Workaround : place it anywhere in a white space (not in another item), then drag'n drop it where it should be to expand the diagram's size.
There is no way to place an item beyond the displayed parts of the diagram, meaning there is nowhere to place it when existing items take already more than all the displayed place.
Workaround : place it anywhere in a white space (not in another item), then drag'n drop it where it should be to expand the diagram's size.