Unless Replication Server has proceeded too far in switching the active and standby databases, you can abort the process by using the abort switch command.
abort switch for logical_ds.logical_db
If the abort switch command cancels the switch active command successfully, you may have to restart the RepAgent for the active database.
You cannot cancel the switch active command after it reaches a certain point. If this is the case, you must wait for the switch active command to complete, then use it again to return to the original active database.