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An error occurred while saving the commentAdam commented
I'm looking for this too. At this point I've transitioned completely over from greader to theoldreader, and it's got basically everything I wanted from greader except for this. Preferably, the sidebar should just have something you can drag to change the width, that would then remember that setting permanently. You could then also presumably put something on that drag bar you could click to minimize it to the side completely, and click again to put it back where it was. I also generally just use all items, but I like having the sidebar visible, personally - just about half as wide.
Barring that, I did intend to look into Stylish... it could modify the width on the client side pretty easily, I've just been lazy and had other things to do. >.>