The FAQ page's been designed with the Table of contents widget (on the left), Heading, and Toggles widgets (on the right)
You can check here the Table of contents widget official guide: https://elementor.com/help/table-of-contents-pro/
In the FAQ page of this example, the Table of contents widget gets all the Heading widgets with the HTML Tag H2
You can edit the Toggle widgets by following the instructions here https://elementor.com/help/toggle-widget/
