Open Google Calendar
In the left sidebar, find the Tasks calendar
Hover over the Tasks calendar
Click the three-dot menu next to it
Select Settings and sharing
Scroll to Remove calendar
Click Unsubscribe or Delete
Confirm the action if prompted
Open Google Calendar
In the left sidebar, find the Tasks calendar
Hover over the Tasks calendar
Click the three-dot menu next to it
Select Settings and sharing
Scroll to Remove calendar
Click Unsubscribe or Delete
Confirm the action if prompted