Hi John!
I’ve updated the other thread about keybindings to note the ones that have changed to avoid Windows-platform-overlap. But this keybinding I’m not sure about - which docs are you quoting? Introduction to notebooks refers to this keybinding as Option-Command-Up which is still the keybinding across platforms (Alt-Command-Up on Windows). Previously we were incorrectly aliasing Command to Ctrl in the help popover, but it will now show Command on both platforms - Windows, the elusive Windows logo key / start key / logo key / flag key / super key / home key.