The path of currently selected files or folders is shown in the address bar at the top of the screen, as per the following screenshot:
You can turn off the address bar by right-clicking on it and unchecking the option.
There is also a shortcut key (Ctrl + C) which copies the full path of the currently selected file or folder to the clipboard. This can be useful for documentation purposes. Depending on whether you have the depot or workspace tab showing, you might get:
Or, depending on your workspace definition: