Collapsible (default: No): show a toggle to open and close the outline
Start Collapsed (default: No): begin closed when Collapsible is Yes
Sticky (default: No): keep the TOC visible while scrolling on desktop (off under 768px). Works even on templates with overflow wrappers such as Helix Ultimate
Scroll Spy (default: Yes): highlight the section currently in view
Smooth Scroll (default: Yes): animated jump to the target heading. Respects prefers-reduced-motion
Scroll Offset (px) (default: 80): extra space under sticky site headers when jumping
Back to Top Link (default: No): optional link at the bottom of the TOC