... But another thing made me curious, what are these sub-views you're talking about? I've never heard of that. Maybe that's what I need for organizing my views and it's already there. How can I create a sub-view?
I agree with your comments about controlling the number of folder nodes.
Sorry, the use of "sub-views" is a bad and inaccurate word choice. I made my smart views some time ago with Winamp. When I first started using WACUP (in 2017), I copied my media library configuration files from Winamp to WACUP. I now see that the smart view editor in WACUP has a few changes.
Anyway what I see in my smart views is just the result of the filter strings I'm using (using advanced mode suggestions). I don't see a way to switch to advanced mode in the current WACUP editor. This may be due to the change of library plug-in from ml_local.dll to ml_ll.dll. The gen_ll.dll plug-in is also no longer used, which may also have something to do with this. Since my old smart views still work, the underlying code must still be present. I just don't see a way to create these views in the way I did before.