IF you have jobs that have been assigned already and you want to change the order.
If any job in the batch has started, you would need to first return that job to pending
Click on the Job and at the top click on actions
Click on "Return to pending"
Now click on any of the remaining jobs in the batch and from the actions menu, click "Clear Entire Batch"
Select all 3 jobs and then move them around as shown below by clicking on the job and placing it where you would like in the batch