No way to permanently remove a document
The sidebar lists all your recent documents, including those that have been autosaved and not manually saved to file. This creates the potential for sensitive information to be shown there.
People might also want a way to ensure that a document isn't saved anywhere from a security perspective.
A good example of this is if someone temporarily pastes a password into the text editor.
We could expose this feature with a x close button shown on hover on the sidebar list items. We could also make the "Discard Changes" menu item change to "Discard Document", if the document has never been saved to disk.