Hello Christopher,

If you create a Bookmarkshelf with Safari as a Client initially, the following would have been set by default.  But otherwise, Reading List items would be hard to find as you have noted.

First of all, the Bookmarkshelf must be structured with a Reading/Unsorted folder.  (The reason for the funky name Reading/Unsorted is that it gets bookmarks from Reading List in Safari and from Unsorted Bookmarks in Firefox.)  Click the tool Settings, tab Structure and make sure that the Reading/Unsorted checkbox is switched on:



If the Reading List checkbox was off, and you switch it on, you'll now have a Reading/Unsorted, but it will be empty.  In order to populate it, you must Import from Safari again by clicking in the menu: Bookmarkshelf ▸ Import (Safari [and possibly others]).  This will move Reading List bookmarks which had been mixed in at the root level during previous imports into Reading/Unsorted.

The second thing is to make sure that you're viewing folders.



The you can easily see everything in your Reading List (Reading/Unsorted).  In the screenshot, I have two bookmarks in my Reading/Unsorted.

Let me know if this does not resolve the issue.