I find it confusing that the CircSidebar is disabled by default. I propose we enable it and remove the preference replacing it with a collapsible navigation that gives us the best of both worlds.
+1 I know some software that does this and it's helpful to be able to collapse and uncollapse. We'd solve the space problem and we could probably also 'remember' the setting for a session?
In bug 31403 we enable CircSideBar by default for new installs.. so I'm going to repurpose this bug to just the 'Make it collapsible' part.
Maybe we should make it 'make all sidebars collapsable' - and I like the idea a lot :) It would be great if we could remember the setting people chose (Cookie or some kid of local storage?) so that when you move around in the module, it doesn't keep coming back again.