If Tablet PC Components are enabled in Windows 8, you may notice that drop-down menus open to the left in your apps, including Articulate apps.
This is controlled by the Handedness setting in Windows 8. If Handedness is set to right-handed (default), menus open to the left. And if it's set to left-handed, menus open to the right.
You can control which direction menus open in Windows 8 by going to the Control Panel and searching for tablet. Open Tablet PC Settings from the search results, and select either Right-handed or Left-handed¬†on the General tab.