You can use ubuntu-support-status to confirm what packages still get Ubuntu support & security fixes if security matters to you (repositories remain open during standard support [ie. till April 2023] so MOTUs can still fix issues even if teams have ended their support), as has been documented elsewhere on this site too.
Many thanks for your reply. I’ve abandoned Chrome Remote Desktop for TeamViewer which works perfectly and does not interfere with the operation of the computer. So please close my request for help and delete my post. Kind regards, David