The table of contents does not make the full use of vertical space in a page. It is too truncated and you need to scroll a lot in longer articles to see the headings below. See the attached screenshot for a visual explanation.

There was a similar request marked as 'Complete' but it doesn't work this way in our KB https://feedback.document360.com/feature-request/p/table-of-contents-full-length-of-right-column