1. To delete a document, hover the mouse over ... and click Delete.
2. Click Yes, I wish to delete to delete the document. If you delete a document that has more than 1 version, all versions of the document are deleted.
Info: To delete a version of a document, go to the Versions tab and click 
to edit the metadata for the version. There, you can delete a version in the same way as you delete a document. You can also assign the status Discarded to versions that are in progress if you do not want to delete the version. Published versions can be sent to history instead of deleting them.
Restore
It is possible to restore deleted documents for 3 months after they have been deleted. This is done in the control panel and so only system administrators can do this.