TG-16 does not appear in Lists. I am assuming this is because of the list limitations of the software.
Yes, it DOES appear in Systems.
And I will guarantee that if I delete systems, TG-16 will probably end up showing up.
Or for testing, set it to cabinet (rotate 270 in settings) and check if it is there. That will confirm as well if it is the too many items to show in that menu problem.
Best way for you is to use systems menu, instead of making seperate groups for system. The systems overvieuw can give a nice video and wheel as well
Just to re-cap, is the remaining issue that some system(s?) don't appear in the Lists menu (but they do appear ok in the Systems wheel)?
If so, can you disable a couple of the currently visible systems in the Lists menu as a test and take a screenshot of what you see in the menu after that. This will confirm if it is the too many items to show in that menu problem.