At Jobs > Activity, you can View information about active Jobs or Abort active Jobs.
Forcing an abort of Jobs that are already in an aborting state
In certain situations, for example when you schedule a Job on a Team that contains offline Agents, the Job can remain in an aborting state when it is aborted manually. You can tackle these situations by selecting a Job that is in an aborting state and click Abort in the command bar. This aborts the Job immediately, without waiting for a response from the Agent that is executing the Job.