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Smooth scroll: if enabled, smooth scroll behavior will be included at your site. This means, to reproduce a smooth scroll when clicking an anchor redirecting to the same page. More info here.
Content selector: determines the element from where the table of contents will get it’s heading selectors.
Heading selector: determines the tag of the elements that will be included at Table of contents. You can also set ids and class selectors, and combine them all by separating with commas. e.g: h2, #my-heading, .toc-heading