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How can I get rid of the calendar tab and tasks tab recently added. I do not want them as I do not use the Calendar

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Please advise how I can remove the recently added calendar button and tasks tab.

Please advise how I can remove the recently added calendar button and tasks tab.

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The calendar and task tabs are added to Thunderbird when you install the 'Lightning' add-on. If you will never use it , you can remove, or deactivate Lightning. 'Tools - Add-ons - Extensions' - look for 'Lightning' - 'Disable' or 'Remove' Any open tabs can be closed by clicking the 'X' in the right corner of each tab.

TB-38.3 Win10-PC