Rows are capacity + per-seat defaults now -- joiners auto-populate them live and launch trims to whoever is seated, so hand-managing rows is busywork. A Seats spinner (1-8) maintains the row count in relay mode; Add pilot / Remove selected remain for mesh mode, where explicit addresses matter. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>