Took me far too long to find this option. Powertools had some annoying quirks that I just couldn’t get passed and I wasn’t using any of it’s good features. Plus either it or the SP1 upgrade has left Visual Studio 2010 in a less than stable state, I find it crashing several times a day. So today I have removed Productivity Power Tools using the following method:
Tools -> Extension Manager -> Productivity Power Tools -> Uninstall