main's z-index makes it a stacking context, so the fixed drawer (z-index 60) could never rise over the sticky sidebar (z-index 20): its title, group labels and first column of widgets sat underneath. Above 900px the drawer now starts at left:220px; below, the sidebar is off-canvas and it keeps the full width. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>