This lists all the Classes where their Include in Tables setting is false

If Include in Tables  is false then no object or instance data will be recorded for the class and also for any objects on child pages and their child pages

So in general, if an object is a parent then one would expect it's class to be included so that the child instances are included.

If you just want to link to, say, a notes page then use a Jump Link rather than a parent.

Note - sometime it may be handy to switch off a classes tables, for testing. Backup first as this may lose data.