Found this helpful article: How to troubleshoot right-click not working on Chrome and Firefox? - Auslogics blog
At this point, it looks like we are dealing with a case of the website admin configured the site to prevent me from using the right-click functionality. Have asked Support to check this.
My only other thing to try is re-installing Chrome, but given that I can’t get right-click to work on Coda on other browsers either, whilst I can right-click on all other websites, and other users are not experiencing this issue, indicates that it is something to do with permissions on my account .
Now waiting for Support to confirm that.