v4.2: How to Activate Sidebar in Ubuntu 12.04

I am unable to get the sidebar to work. I tried following the instructions for activating the new experimental bar here, however they were ineffectual. Upon restarting LibreOffice, I did go back into settings and make sure the change had “stuck”, and it did. How ought I go about doing this?

I am using the latest versions of LibreOffice and Ubuntu 12.04.

I have Ubuntu 14.04, with the same issue. Sidebar nowhere to be found.