I've had some split tests of this hit me (I think) over the last few weeks. On my netbook it hid the sidebar (I think this was deliberate and not a split) I'v

I've had some split tests of this hit me (I think) over the last few weeks. On my netbook it hid the sidebar (I think this was deliberate and not a split) I've also had it appearing/disappearing by default on various desktop machines (I think that was a split). I have to confess it is growing on my as a feature. The icons convinced me to start using the filters and some of them are useful.