Elicenser - Transfer from one dongle to another

That would be a valid assumption.

You can check whether your license is currently being used:
eLCC will show an “Application-Instances” count written on the license, as soon as any program is using that license.

Also, you can simply start dragging the license to see if it is currently being transferable.
If the license is not transferable, you wouldn’t be able to “grab” it with the mouse/cursor in the first place.