Collapsible Columns

Hello, I have users requesting the ability to collapse columns. Specifically the div.sidebar column where the list of various overviews is contained. I tried using a sidebar.css file in the app/assets/stylesheets/custom/ directory, followed by a rake and restart to no-avail. Is it possible to get an update where we can collapse columns down? I realize this is a low priority concern but I have multiple users stating that it is impeding their personal workflow so I wanted to bring it up. Thank you in advance.