Finder Device list is too wide and won't adjust

Okay so my Finder window's device list is way too wide (likely due to the name of my computer, because it seems to stretch out exactly that far). Whenever I re-size it, the changes never stick. It always goes back to the same width the next time I open a Finder window. This isn't a pressing issue, but it's pretty annoying. Is there a way to save window alignments?

The left is how it always is when I open it, the right is how I want it to stay. If there's a way to do this, I know I'm going to feel idiotic. But I have to ask because it's annoying the crap out of me.