Hi Thomas,
I'm Sumit, here to answer your query at the Microsoft Community.
It is inside the Copilot Settings now.
Please copy and paste:
edge://settings/sidebar/appSettings?hubApp=cd4688a9-e888-48ea-ad81-76193d56b1be
Turn off the sidebar option.
Hope that helps, and rely on us for any further inquiries. All the best.