On your local machine (Windows), across the top of the Secure Shell File Transfer window, there is a row of menu items that says "File Edit View Operation".
Click the "View" item. This will cause a drop-down menu to appear.
In that menu, click the box to the left of "Show Root Directory" or "View Root Directory/Files".
This will cause the tree view of the remote file system (on the left side of the window) to change, giving you a view of all of the remote machine's files, starting with "/" (the root directory) at the top of the tree.
Now you can navigate to any readable directory on the remote machine.