Hello Lavecoi,
In the Navigation Pane, try clicking on the arrow to the left of the folder, or double clicking on the folder instead to see how that allows it to expand for you.
If you have Expand to current folder checked and click on a folder in the main Windows Explorer window and it does not expand to it in the Navigation Pane, then close and reopen Windows Explorer to see if does afterwards.
Hope this helps,
Shawn