Several reports provide an option to select multiple items and perform actions on them in bulk.
You'll see checkboxes appear on the left-hand side of the list. Once one or more items have been selected, the options for batch processing become available to click above the list.
You can also select all items in the list by clicking the checkbox in the header.
Each report has its own set of batch processing options. See the help documentation for the relevant section for further information.