Bulk Edit
With Structure, you can quickly select multiple work items and edit them using the Jira bulk operation wizard.
To edit multiple work items:
Select the work items by clicking the small squares at the left of each item row. You can also select work items by pressing Space, Shift+Space, or another Keyboard Shortcut for selecting work items.
Click Bulk Edit.

This will open the Jira bulk operation wizard, which allows you to perform bulk changes on all the selected work items.
Each Bulk Edit operation is currently limited to approximately 200 work items.