you have to remove/delete connection you have created and then killing qv.exe process should kill task too.
Ideally in this case i usually also restart NPrinting services.
That is currently only way of killing this task.
if you want to preview your tasks details go to this "unofficial" url adress in NPrinting console:
https://localhost (or servername):4993/#/tasks/executions
you should see all active and finished tasks there.
Yep - there is no console trigger yet - but i heard they are working on it.
I trust eventually it will be there.
We have to remember that NPrinting 17 is (at least in my opinion ) completly new product and is +/- only 1.5 - 2 years on market only. There is still a lot to improve and create. I think it is happening, but i requires some time.