How can I disable the preview of the last documents in the start screen?

Starting with LO 4.2, the start screen shows a preview of the last documents.
I think this feature has potential for a number of privacy issues, so I would like to disable it.
However, I could not find an option to do so in the settings. How can I switch this off?

Please have a look at Can I supress the images on the start screen?.

See also: Tagged “start-screen”*