The Delete button will let you delete files or folders.
Use the checkbox to select the files and folders, and then click the Delete button. Deleted files can be restored by the administrator during a period this is typically set to 72 hours. Some sites have different purge retention settings, so check with your site administrator as early as possible if you think you need data restored. Retention policies may also automatically delete aged files and policy management is set by the site retention administrator which is a role assigned by the site administrator.