From 900px up, selects and text fields fill their column up to 480px, numbers and dates are 140px, and long text stays full width, so every form shares one right edge. Below 900px every field runs full width. Overrides core's id-pinned widths (% Done, mobile dates, settings textareas). check-form-alignment.mjs now checks widths at 1440, 1024 and 390px across all settings tabs and admin forms. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>