So far, I found there are some interesting ways to search in global structure:
InterSystems has always provided -- with each maintenance release -- a document that describes all the changes in that maintenance release. This document is known informally as the relnotes or (now) the MRNotes*. Here’s a link to one of them, just to make sure we’re on the same page: https://docs.intersystems.com/iris20211/csp/docbook/relnotes/index.html