CM Table of Contents (CMTOC) - Widget
The plugin comes with Table of Content widget which allows to place in widget area instead of over post/page content.
To display Table of Content in widget area, go to Admin Panel -> Appearance -> Widgets and place Table of Content widget in selected widget area.
Enter widget title and save.
Open post/page edit page and check Search for Table of Contents items... to enable searching TOC items and Disable automatic display... to hide standard TOC on this page. Update post/page.
Below: Front-end view of post with Table of Contents as widget.