The letters name a panel; the numbers count them. One is the leftmost panel in the right section, so the number matches the icon a user would point at: a widget with no panel of its own is passed over, and so is one that is hiding itself. Counting rather than naming means the hotkeys follow the bar. Rearranging the section, or adding a widget to it, renumbers the panels with no binding to rewrite. Co-authored-by: Claude Opus 5 <noreply@anthropic.com>