In Windows 8.1 (maybe Windows 8 & 7 too, one needs to verify this), vous pouvez add the Navigation Pane option to the Quick Access Toolbar. Vous pouvez then use the Alt+{NumberKey} shortcut followed by the Enter key to show/hide the Navigation Pane.
For example: in my case, the Navigation Pane icon is the third item in the Quick Access Toolbar, so I would press Alt+3 and then Enter to turn the pane on/off.
This has improved my workflow tremendously. Hope it helps you too.
HowTo: Configure
open Windows Explorateur de fichiers
faites un clic droit sur View tab
faites un clic droit sur Navigation Pane toolbar button
click Add to Quick Access Toolbar menu item
Screen Shots
Figure1: Right-Click Menu
Figure2: Quick Access Toolbar with Navigation Pane
Related Notes
With respect to the Quick Access Toolbar, it is important to note that:
Shortcuts are assigned left to right. Par exemple, with reference to Figure2:
Alt+1 = show properties
Alt+2 = create new folder
Alt+3 = show/hide Navigation Pane
Shortcuts only work with the number keys en haut of a QWERTY keyboard. They do not work with the number pad number keys.