Glad you solved the problem.
You wrote, "I won't be missing sleep over the Show Parent Folder command which is still missing." LR has the option of hiding parent folders in the Folders pane. In your example, you might decide to hide C:\ and C:\Photos (the subfolders will still be visible). So if you right-click C:, you should see the Hide Parent Folder command. If you give that command, C: will disappear from the Folders pane. You can then right-click Photos and select Show Parent Folder to get C: to appear again.