This enhancement is a part of the March 19, 2022 release.
You can now configure the Tabbed Widget to display content in a stacked accordion configuration. This allows content editors to present information in a more condensed format making better use of page space and creating a better user experience for individuals accessing the content.
When the Position option is configured to ‘Stacked Accordion,’ all tab panels will be in the closed position as the page loads. A user is also able to expand and collapse single or multiple tab panels.