I used Thunderbird to sync an academic email using Google Classroom as backend and once the course was over and the email deactivated, I disabled sync in Thunderbird for that account so that I have a backup of my emails. The problem is the Calendar is still attempting to sync and showing an annoying Google sign-in window on each launch with no clear option to disable that specific account. An option to control calendar sync (and combining it with email sync) from the account management view would be very useful for scenarios such as these.