With my recent update my calander disappeared. What happened? I can't find it anywhere

Did your Calendar tab disappear from th Thunderbird main window? Or, when you open the Calendar tab is your calendar missing in the calendar pane?

The tab is missing from the main window

Go the Thunderbird menu bar > Events and Tasks ans select 'Calendar' Or in the Spaces tool bar on the left of the main Window click on the 'Calendar' symbol

Thanks Got it