I learn keys using C-h m, bound to describe-mode. And I also check what modes I'm in if I certain keybindings don't seem to be working. It's this latter case that in an edge build of emacs (30.0.50), something has changed.
Before, describe-mode would helpfully list all active modes up front–easy to scan.
Minor modes enabled in this buffer: Auto-Save Centered-Cursor
Company-Box Company Font-Lock Org-Bullets Org-Indent Visual-Line Yas
The major mode is Org mode defined in org.el:
Outline-based notes management and organizer, alias
"Carsten’s outline-mode for keeping track of everything."
But now this text that shows all modes is gone. I'm not sure if it's because I upgraded emacs 30 or something else, but describe mode now has an outline. I found the variable by autocompleting for describe- and found describe-mode-outline, which you can customize and turn it off. Phew.