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Sign in TickTick on the web.
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Click the ··· button beside a list name. (Note that this button is hidden until the mouse hovers over it. When the mouse is not hovering over it, it shows a number indicating the total tasks contained in the list).
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Click Delete, then confirm it.
Note: Once a list is deleted, all tasks within that list will be removed as well. You may only recover them from Trash.