Go to Unmanaged Documents Page by selecting from the top Menu → Documents → Unmanaged.
Navigate to the folder where files are located.
Select files by check the checkboxes on the first column.
Click the DELETE button.
Click the OK button to confirm the delete action.
For Managed Documents
Go to Managed Documents Page by selecting from the top Menu → Documents → Managed.
Navigate to the folder where files are located.
Select files by Details next to the desired file.
Click the DELETE button.
If your company has set up to use the Trash for shared files, the deleted files are not actually deleted, and they are moved to Trash instead. To remove the files for good, you need to empty the Trash.
Go to the top Menu and select Documents → Trash
Select files to be emptied or click select all box.