In Windows 7, by default, Explorer’s sidebar stays the same size unless you click within it. That is, if you use the rightpane to navigate through folders, as most of us do, the left sidebar doesn’t change. With a simple tweak, though, you can have the left sidebar focus on your current folder in the tree as you click around the right pane. To enable this feature:
via
Make Windows Explorer’s Sidebar Expand As You Navigate Through Folders | Lifehacker Australia

Click here to view the entire blog post.
- Open up Explorer and go to Organize > Folder and Search Options.
- On the General tab, look under “Navigation Pane” and check “Automatically expand to current folder”.
via
Make Windows Explorer’s Sidebar Expand As You Navigate Through Folders | Lifehacker Australia
Click here to view the entire blog post.