"For downloading in bulk, you will need to follow the below process

You need to click on the deployment name where the list of subjects are available. Next to the subject title we will see the checkboxes. Click on those checkboxes to select the required subjects and once selected, Download report option is visible. Click on that to download the report directly or you may go to manage data>> download to view the report.

screenshot https://www.screencast.com/t/ZhqJK8AlhPeQ"